A pteridophyte is a vascular plant that disperses spores. Because pteridophytes produce neither flowers nor seeds, they are referred to as "cryptogams", meaning that their means of reproduction is hidden; the pteridophytes include the ferns and the lycophytes. These are not a monophyletic group because ferns and horsetails are more related to seed plants than to the lycophytes. Therefore, "Pteridophyta" is no longer a accepted taxon, although the term pteridophyte remains in common parlance, as do pteridology and pteridologist as a science and its practitioner, to indicate lycophytes and ferns as an informal grouping, such as the International Association of Pteridologists and the Pteridophyte Phylogeny Group. Ferns and lycophytes are free-sporing vascular plants that have a life cycle with free-living, independent gametophyte and sporophyte phases, their other common characteristics include vascular plant apomorphies and land plant plesiomorphies. Of the pteridophytes, ferns account for nearly 90% of the extant diversity.
Smith et al. the first higher-level pteridophyte classification published in the molecular phylogenetic era, considered the ferns as monilophytes, as follows: Division Tracheophyta - vascular plants Sub division Euphyllophytina Infradivision Moniliformopses Infradivision Spermatophyta - seed plants, ~260,000 species Subdivision Lycopodiophyta - less than 1% of extant vascular plantswhere the monilophytes comprise about 9,000 species, including horsetails, whisk ferns, all eusporangiate and all leptosporangiate ferns. Both lycophytes and monilophytes were grouped together as pteridophytes on the basis of being spore-bearing. In Smith's molecular phylogenetic study the ferns are characterised by lateral root origin in the endodermis mesarch protoxylem in shoots, a pseudoendospore, plasmodial tapetum, sperm cells with 30-1000 flagella; the term "moniliform" as in Moniliformopses and monilophytes means "bead-shaped" and was introduced by Kenrick and Crane as a scientific replacement for "fern" and became established by Pryer et al..
Christenhusz and Chase in their review of classification schemes provide a critique of this usage, which they discouraged as irrational. In fact the alternative name Filicopsida was in use. By comparison "lycopod" or lycophyte means wolf-plant; the term "fern ally" included under Pteridophyta refers to vascular spore-bearing plants that are not ferns, including lycopods, whisk ferns and water ferns, a much wider range of taxa. This is not a natural grouping but rather a convenient term for non-fern, is discouraged, as is eusporangiate for non-leptosporangiate ferns; however both Infradivision and Moniliformopses are invalid names under the International Code of Botanical Nomenclature. Ferns, despite forming a monophyletic clade, are formally only considered as four classes, 11 orders and 37 families, without assigning a higher taxonomic rank. Furthermore, within the Polypodiopsida, the largest grouping, a number of informal clades were recognised, including leptosporangiates, core leptosporangiates and eupolypods.
In 2014 Christenhusz and Chase, summarising the known knowledge at that time, treated this group as two separate unrelated taxa in a consensus classification. 1,300 species Polypodiophyta 4 sublasses, 11 orders, 21 families, approx. 212 genera, approx. 10,535 species Subclass Equisetidae Warm. Subclass Ophioglossidae Klinge Subclass Marattiidae Klinge Subclass Polypodiidae Cronquist, Takht. & Zimmerm. These subclasses correspond to Smith's four classes, with Ophioglossidae corresponding to Psilotopsida; the two major groups included in Pteridophyta are phylogenetically related as follows: Pteridophytes consist of two separate but related classes, whose nomenclature has varied. The terminology used by the Pteridophyte Phylogeny Group is used here: Classes and ordersLycopodiopsida Lycopodiidae Selaginellidae Polypodiopsida Equisetidae Ophioglossidae Psilotales Ophioglossales Marattiidae Polypodiidae In addition to these living groups, several groups of pteridophytes are now extinct and known only from fossils.
These groups include the Rhyniopsida, Zosterophyllopsida, Trimerophytopsida, the Lepidodendrales and the Progymnospermopsida. Modern studies of the land plants agree that all pteridophytes share a common ancestor with seed plants. Therefore, pteridophytes constitute a paraphyletic group. Just as with seed plants and mosses, the life cycle of pteridophytes involves alternation of generations; this means. Pteridophytes differ from mosses and seed plants in that both generations are independent and free-living, although the sporophyte is much larger and more conspicuous; the sexuality of pteridophyte gametophytes can be classifi
Bratislava is the capital of Slovakia. With a population of about 430,000, it is one of the smaller capitals of Europe but still the country's largest city; the greater metropolitan area is home to more than 650,000 people. Bratislava is in southwestern Slovakia, occupying both banks of the River Danube and the left bank of the River Morava. Bordering Austria and Hungary, it is the only national capital; the city's history has been influenced by people of different nations and religions, namely Austrians, Croats, Germans, Jews and Slovaks. It was the coronation site and legislative center of the Kingdom of Hungary from 1536 to 1783, has been home to many Slovak and German historical figures. Bratislava is the political and economic centre of Slovakia, it is the seat of the parliament and the Slovak Executive. It has several universities, many museums, theatres and other cultural and educational institutions. Many of Slovakia's large businesses and financial institutions have headquarters there. In 2017, Bratislava was ranked as the third richest region of the European Union by GDP per capita.
GDP at purchasing power parity is about three times higher than in other Slovak regions. Bratislava receives around 1 million tourists every year; the city received its contemporary name in 1919. Until it was known in English by its German name, since after 1526 it was dominated by the Habsburg Monarchy and the city had a relevant ethnic-German population; that is the term from which the pre-1919 Czech names are derived. The city's Hungarian name, was given after the castle's first castellan, "Poson"; the origin of the name is unclear: it might come from the Czech Pos or the German Poscho, which are personal names. The medieval settlement Brezalauspurc is sometimes attributed to Bratislava, but the actual location of Brezalauspurc is under scholarly debate; the city's modern name is credited to Pavel Jozef Šafárik's misinterpretation of Braslav as Bratislav in his analysis of mediaeval sources, which led him to invent the term Břetislaw, which became Bratislav. During the revolution of 1918–1919, the name'Wilsonov' or'Wilsonstadt' was proposed by American Slovaks, as he supported national self-determination.
The name Bratislava, used only by some Slovak patriots, became official in March 1919. Other alternative names of the city in the past include Greek: Ιστρόπολις Istropolis, Czech: Prešpurk, French: Presbourg, Italian: Presburgo, Latin: Posonium, Romanian: Pojon and Serbo-Croatian: Požun / Пожун. In older documents, confusion can be caused by the Latin forms Bratislavia, Wratislavia etc. which refer to Wrocław, not Bratislava. The first known permanent settlement of the area began with the Linear Pottery Culture, around 5000 BC in the Neolithic era. About 200 BC, the Celtic Boii tribe founded the first significant settlement, a fortified town known as an oppidum, they established a mint, producing silver coins known as biatecs. The area fell under Roman influence from the 1st to the 4th century AD and was made part of the Danubian Limes, a border defence system; the Romans introduced grape growing to the area and began a tradition of winemaking, which survives to the present. The Slavs arrived from the East between the 6th centuries during the Migration Period.
As a response to onslaughts by Avars, the local Slavic tribes rebelled and established Samo's Empire, the first known Slavic political entity. In the 9th century, the castles at Bratislava and Devín were important centres of the Slavic states: the Principality of Nitra and Great Moravia. Scholars have debated the identification as fortresses of the two castles built in Great Moravia, based on linguistic arguments and because of the absence of convincing archaeological evidence; the first written reference to a settlement named "Brezalauspurc" dates to 907 and is related to the Battle of Pressburg, during which a Bavarian army was defeated by the Hungarians. It is connected to the fall of Great Moravia weakened by its own inner decline and under the attacks of the Hungarians; the exact location of the battle remains unknown, some interpretations place it west of Lake Balaton. In the 10th century, the territory of Pressburg became part of Hungary, it developed as a key administrative centre on the kingdom's frontier.
This strategic position destined the city to be the site of frequent attacks and battles, but brought it economic development and high political status. It was granted its first known "town privileges" in 1291 by the Hungarian King Andrew III, was declared a free royal town in 1405 by King Sigismund. In 1436 he authorized the town to use its own coat of arms; the Kingdom of Hungary was defeated by the Ottoman Empire in the Battle of Mohács in 1526. The Turks failed to conquer it. Owing to Ottoman advances into Hungarian territory, the city was designated the new capital of Hungary in 1536, after becoming part of the Habsburg Monarchy and marking the beginning of a new era; the city became a coronation town and the seat of kings, the nobility and all major organisations and offices. Between 1536 and 1830, eleven Hungarian kings and queens were crowned at St. Martin's Cathedral. The
Paleobotany spelled as palaeobotany, is the branch of paleontology or paleobiology dealing with the recovery and identification of plant remains from geological contexts, their use for the biological reconstruction of past environments, both the evolutionary history of plants, with a bearing upon the evolution of life in general. A synonym is paleophytology. Paleobotany includes the study of terrestrial plant fossils, as well as the study of prehistoric marine photoautotrophs, such as photosynthetic algae, seaweeds or kelp. A related field is palynology, the study of fossilized and extant spores and pollen. Paleobotany is important in the reconstruction of ancient ecological systems and climate, known as paleoecology and paleoclimatology respectively. Paleobotany has become important to the field of archaeology for the use of phytoliths in relative dating and in paleoethnobotany; the emergence of paleobotany as a scientific discipline can be seen in the early 19th century in the works of the German palaeontologist Ernst Friedrich von Schlotheim, the Czech nobleman and scholar Kaspar Maria von Sternberg, the French botanist Adolphe-Théodore Brongniart.
Macroscopic remains of true vascular plants are first found in the fossil record during the Silurian Period of the Paleozoic era. Some dispersed, fragmentary fossils of disputed affinity spores and cuticles, have been found in rocks from the Ordovician Period in Oman, are thought to derive from liverwort- or moss-grade fossil plants. An important early land plant fossil locality is the Rhynie Chert, found outside the village of Rhynie in Scotland; the Rhynie chert is an Early Devonian sinter deposit composed of silica. It is exceptional due to its preservation of several different clades of plants, from mosses and lycopods to more unusual, problematic forms. Many fossil animals, including arthropods and arachnids, are found in the Rhynie Chert, it offers a unique window on the history of early terrestrial life. Plant-derived macrofossils become abundant in the Late Devonian and include tree trunks and roots; the earliest tree was thought to be Archaeopteris, which bears simple, fern-like leaves spirally arranged on branches atop a conifer-like trunk, though it is now known to be the discovered Wattieza.
Widespread coal swamp deposits across North America and Europe during the Carboniferous Period contain a wealth of fossils containing arborescent lycopods up to 30 meters tall, abundant seed plants, such as conifers and seed ferns, countless smaller, herbaceous plants. Angiosperms evolved during the Mesozoic, flowering plant pollen and leaves first appear during the Early Cretaceous 130 million years ago. A plant fossil is any preserved part of a plant; such fossils may be prehistoric impressions that are many millions of years old, or bits of charcoal that are only a few hundred years old. Prehistoric plants are various groups of plants. Plant fossils can be preserved in a variety of ways, each of which can give different types of information about the original parent plant; these modes of preservation are discussed in the general pages on fossils but may be summarised in a palaeobotanical context as follows. Adpressions; these are the most found type of plant fossil. They provide good morphological detail of dorsiventral plant parts such as leaves.
If the cuticle is preserved, they can yield fine anatomical detail of the epidermis. Little other detail of cellular anatomy is preserved. Petrifactions; these provide fine detail of the cell anatomy of the plant tissue. Morphological detail can be determined by serial sectioning, but this is both time consuming and difficult. Moulds and casts; these only tend to preserve the more robust plant parts such as seeds or woody stems. They can provide information about the three-dimensional form of the plant, in the case of casts of tree stumps can provide evidence of the density of the original vegetation. However, they preserve any fine morphological detail or cell anatomy. A subset of such fossils are pith casts, where the centre of a stem is either hollow or has delicate pith. After death, sediment forms a cast of the central cavity of the stem; the best known examples of pith casts are in cordaites. Authigenic mineralisations; these can provide fine, three-dimensional morphological detail, have proved important in the study of reproductive structures that can be distorted in adpressions.
However, as they are formed in mineral nodules, such fossils can be of large size. Fusain. Fire destroys plant tissue but sometimes charcoalified remains can preserve fine morphological detail, lost in other modes of preservation. Fusain fossils are delicate and small, but because of their buoyancy can drift for long distances and can thus provide evidence of vegetation away from areas of sedimentation. Plant fossils always represent disarticulated parts of plants; those few examples of plant fossils that appear to be the remains of whole plants in fact are incomplete as the internal cellular tis
Algae is an informal term for a large, diverse group of photosynthetic eukaryotic organisms that are not closely related, is thus polyphyletic. Including organisms ranging from unicellular microalgae genera, such as Chlorella and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to 50 m in length. Most are aquatic and autotrophic and lack many of the distinct cell and tissue types, such as stomata and phloem, which are found in land plants; the largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of green algae which includes, for example and the stoneworts. No definition of algae is accepted. One definition is that algae "have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells". Although cyanobacteria are referred to as "blue-green algae", most authorities exclude all prokaryotes from the definition of algae.
Algae constitute a polyphyletic group since they do not include a common ancestor, although their plastids seem to have a single origin, from cyanobacteria, they were acquired in different ways. Green algae are examples of algae that have primary chloroplasts derived from endosymbiotic cyanobacteria. Diatoms and brown algae are examples of algae with secondary chloroplasts derived from an endosymbiotic red alga. Algae exhibit a wide range of reproductive strategies, from simple asexual cell division to complex forms of sexual reproduction. Algae lack the various structures that characterize land plants, such as the phyllids of bryophytes, rhizoids in nonvascular plants, the roots and other organs found in tracheophytes. Most are phototrophic, although some are mixotrophic, deriving energy both from photosynthesis and uptake of organic carbon either by osmotrophy, myzotrophy, or phagotrophy; some unicellular species of green algae, many golden algae, euglenids and other algae have become heterotrophs, sometimes parasitic, relying on external energy sources and have limited or no photosynthetic apparatus.
Some other heterotrophic organisms, such as the apicomplexans, are derived from cells whose ancestors possessed plastids, but are not traditionally considered as algae. Algae have photosynthetic machinery derived from cyanobacteria that produce oxygen as a by-product of photosynthesis, unlike other photosynthetic bacteria such as purple and green sulfur bacteria. Fossilized filamentous algae from the Vindhya basin have been dated back to 1.6 to 1.7 billion years ago. The singular alga retains that meaning in English; the etymology is obscure. Although some speculate that it is related to Latin algēre, "be cold", no reason is known to associate seaweed with temperature. A more source is alliga, "binding, entwining"; the Ancient Greek word for seaweed was φῦκος, which could mean either the seaweed or a red dye derived from it. The Latinization, fūcus, meant the cosmetic rouge; the etymology is uncertain, but a strong candidate has long been some word related to the Biblical פוך, "paint", a cosmetic eye-shadow used by the ancient Egyptians and other inhabitants of the eastern Mediterranean.
It could be any color: black, green, or blue. Accordingly, the modern study of marine and freshwater algae is called either phycology or algology, depending on whether the Greek or Latin root is used; the name Fucus appears in a number of taxa. The algae contain chloroplasts. Chloroplasts contain circular DNA like that in cyanobacteria and are interpreted as representing reduced endosymbiotic cyanobacteria. However, the exact origin of the chloroplasts is different among separate lineages of algae, reflecting their acquisition during different endosymbiotic events; the table below describes the composition of the three major groups of algae. Their lineage relationships are shown in the figure in the upper right. Many of these groups contain some members; some retain plastids, but not chloroplasts. Phylogeny based on plastid not nucleocytoplasmic genealogy: Linnaeus, in Species Plantarum, the starting point for modern botanical nomenclature, recognized 14 genera of algae, of which only four are considered among algae.
In Systema Naturae, Linnaeus described the genera Volvox and Corallina, a species of Acetabularia, among the animals. In 1768, Samuel Gottlieb Gmelin published the Historia Fucorum, the first work dedicated to marine algae and the first book on marine biology to use the new binomial nomenclature of Linnaeus, it included elaborate illustrations of seaweed and marine algae on folded leaves. W. H. Harvey and Lamouroux were the first to divide macroscopic algae into four divisions based on their pigmentation; this is the first use of a biochemical criterion in plant systematics. Harvey's four divisions are: red algae, brown algae, green algae, Diatomaceae. At this time, microscopic algae were discovered and reported by a different group of workers studying the Infusoria. Unlike macroalgae, which were viewed as plants, microalgae were considered animals because they are motile; the nonmotile microalgae were sometimes seen as stages of the lifecycle of plants, macroalgae, or animals. Although used as a taxonomic category in some pre-D
History of botany
The history of botany examines the human effort to understand life on Earth by tracing the historical development of the discipline of botany—that part of natural science dealing with organisms traditionally treated as plants. Rudimentary botanical science began with empirically-based plant lore passed from generation to generation in the oral traditions of paleolithic hunter-gatherers; the first written records of plants were made in the Neolithic Revolution about 10,000 years ago as writing was developed in the settled agricultural communities where plants and animals were first domesticated. The first writings that show human curiosity about plants themselves, rather than the uses that could be made of them, appears in the teachings of Aristotle's student Theophrastus at the Lyceum in ancient Athens in about 350 BC. In Europe, this early botanical science was soon overshadowed by a medieval preoccupation with the medicinal properties of plants that lasted more than 1000 years. During this time, the medicinal works of classical antiquity were reproduced in manuscripts and books called herbals.
In China and the Arab world, the Greco-Roman work on medicinal plants was extended. In Europe the Renaissance of the 14th–17th centuries heralded a scientific revival during which botany emerged from natural history as an independent science, distinct from medicine and agriculture. Herbals were replaced by floras: books; the invention of the microscope stimulated the study of plant anatomy, the first designed experiments in plant physiology were performed. With the expansion of trade and exploration beyond Europe, the many new plants being discovered were subjected to an rigorous process of naming and classification. Progressively more sophisticated scientific technology has aided the development of contemporary botanical offshoots in the plant sciences, ranging from the applied fields of economic botany, to the detailed examination of the structure and function of plants and their interaction with the environment over many scales from the large-scale global significance of vegetation and plant communities through to the small scale of subjects like cell theory, molecular biology and plant biochemistry.
Botany and zoology are the core disciplines of biology whose history is associated with the natural sciences chemistry and geology. A distinction can be made between botanical science in a pure sense, as the study of plants themselves, botany as applied science, which studies the human use of plants. Early natural history divided pure botany into three main streams morphology-classification and physiology – that is, external form, internal structure, functional operation; the most obvious topics in applied botany are horticulture and agriculture although there are many others like weed science, plant pathology, pharmacognosy, economic botany and ethnobotany which lie outside modern courses in botany. Since the origin of botanical science there has been a progressive increase in the scope of the subject as technology has opened up new techniques and areas of study. Modern molecular systematics, for example, entails the principles and techniques of taxonomy, molecular biology, computer science and more.
Within botany there are a number of sub-disciplines that focus on particular plant groups, each with their own range of related studies. Included here are: phycology, pteridology and palaeobotany and their histories are treated elsewhere. To this list can be added mycology, the study of fungi, which were once treated as plants, but are now ranked as a unique kingdom. Nomadic hunter-gatherer societies passed on, by oral tradition, what they knew about the different kinds of plants that they used for food, poisons, for ceremonies and rituals etc; the uses of plants by these pre-literate societies influenced the way the plants were named and classified—their uses were embedded in folk-taxonomies, the way they were grouped according to use in everyday communication. The nomadic life-style was drastically changed when settled communities were established in about twelve centres around the world during the Neolithic Revolution which extended from about 10,000 to 2500 years ago depending on the region.
With these communities came the development of the technology and skills needed for the domestication of plants and animals and the emergence of the written word provided evidence for the passing of systematic knowledge and culture from one generation to the next. During the Neolithic Revolution plant knowledge increased most through the use of plants for food and medicine. All of today's staple foods were domesticated in prehistoric times as a gradual process of selection of higher-yielding varieties took place unknowingly, over hundreds to thousands of years. Legumes were cultivated on all continents but cereals made up most of the regular diet: rice in East Asia and barley in the Middle east, maize in Central and South America. By Greco-Roman times popular food plants of today, including grapes, apples and olives, were being listed as named varieties in early manuscripts. Botanical authority William Stearn has observed that "cultivated plants are mankind's most vital and precious heritage from remote antiquity".
It is from the Neolithic, in about 3000 BC, that we glimpse the first known illustrations of plants and read descript
Chicago Botanic Garden
The Chicago Botanic Garden is a 385-acre living plant museum situated on nine islands in the Cook County Forest Preserves. It features 27 display gardens in four natural habitats: McDonald Woods, Dixon Prairie, Skokie River Corridor, Lakes and Shores; the address for the garden is 1000 Lake Cook Road, Illinois. The garden is open every day of the year. Admission is free; the Chicago Botanic Garden is owned by the Forest Preserve District of Cook County, managed by the Chicago Horticultural Society. It opened to the public in 1972, is home to the Joseph Regenstein Jr. School of the Chicago Botanic Garden, offering a number of classes and certificate programs; the Chicago Botanic Garden is accredited by the American Alliance of Museums and is a member of the American Public Gardens Association. The Chicago Botanic Garden has 50,000 members, the largest membership of any U. S. public garden, is Chicago's 7th largest cultural institution and 12th-ranking tourist attraction. The 25 display gardens and four natural habitats include: The Aquatic Garden Bonsai Collection The Bulb Garden The Grunsfeld Children's Growing Garden The Circle Garden Crescent Garden Dwarf Conifer Garden Enabling Garden English Oak Meadow English Walled Garden Esplanade Evening Island Regenstein Fruit & Vegetable Garden Great Basin & Water Gardens Greenhouses The Green Roof Heritage Garden Kleinman Family Cove Lakeside Garden Landscape Gardens Elizabeth Hubert Malott Japanese Garden Mary Mix McDonald Woods The Plant Evaluation Gardens Suzanne S. Dixon Prairie Native Plant Garden Model Railroad Garden The Bruce Krasberg Rose Garden Sensory Garden Skokie River Spider Island Waterfall Garden The architectural design for the Chicago Botanic Garden began with the creation of the master plan by John O. Simonds and Geoffrey Rausch.
Several famous buildings have been designed by well-known architects since 1976. 1976, Education Center, Edward Larabee Barnes 1982, Japanese Garden, Koichi Kawana 1983, Heritage Garden, Geoffrey Rausch 2004, Dan Kiley 2009, Conservation Science Center, Booth Hansen The Chicago Botanic Garden opened the Daniel F. and Ada L. Rice Plant Conservation Science Center, located at the south end of the garden, to the public on September 23, 2009. In September 2010, the Plant Science Center earned a GOLD LEED rating from the U. S. Green Building Council because of its sustainable design; the Chicago Botanic Garden conserves rare plant species, is working with regional and international organizations on behalf of plant conservation. The garden is a partner in the Seeds of Success project, a branch of the Millennium Seed Bank Partnership managed by the Royal Botanic Gardens, Kew; the goal is to collect 10,000 seeds from each of 1,500 native species of the Midwest for conservation and restoration efforts.
The garden is a partner in the Plants of Concern initiative to monitor rare species in Northeastern Illinois. The garden is a member of Chicago Wilderness, a consortium of 200 local institutions dedicated to preserving and restoring Chicago's natural areas, as well as the Center for Plant Conservation, a group of 30 other botanic gardens and arboreta committed to conserving rare plants from their regions. Degree programs offered at the School of the Chicago Botanic Garden: L. E. A. P. Ph. D. Program – Landscapes and Anthropogenic Processes is a Ph. D. program offered by the University of Illinois at Chicago in partnership with the Chicago Botanic Garden. University of Chicago Committee on Evolutionary Biology Ph. D. Program University of Illinois Chicago Ecology & Evolution Group Ph. D. ProgramCertificate programs offered at the School of the Chicago Botanic Garden: Photography Horticultural Therapy Midwest Gardening Professional Gardener Garden Design Botanical Arts Healthcare Garden Design Ornamental Plant MaterialsOther educational programs available at the garden include the Green Youth Farm, the Windy City Harvest, the Cook County Sheriff's Vocational Rehabilitation Impact Center.
In 2008, the Chicago Botanic Garden was chosen by the United Nations Environment Programme as the sole North American host for World Environment Day with the theme "CO2—Kick the Habit!: Towards a Low Carbon Economy". Over 30 nonprofit, academic and environmental organizations participated in the "Knowledge and Action Marketplace" on the garden's Esplanade. Displays and representatives discussed products to help green homes, local carpools and community conservation programs, classes on green gardening, the use of CFL light bulbs, vehicles that run on used vegetable oil, appliances that pop popcorn using solar energy. Organizations participating in the event included: the Center for Neighborhood Technology, offering car-sharing information CNT Energy, working with ComEd to provide information about Watt Spot, a program to assist homeowners who want to pay market price for electricity Northern Illinois Energy Project, who provided free CFL bulbs Chicago Wilderness and Openlands, who provided information about local conservation and restoration programs Horrigan Urban Forest Products, who highlighted the best uses for reclaimed wood from urban treesThe garden hosted its first International Climate Change Forum on that day, featuring national and international experts, including Dr. Ashok Khosla, former chairman on the UNEP.
International Code of Nomenclature for algae, fungi, and plants
The International Code of Nomenclature for algae and plants is the set of rules and recommendations dealing with the formal botanical names that are given to plants, fungi and a few other groups of organisms, all those "traditionally treated as algae, fungi, or plants". It was called the International Code of Botanical Nomenclature; the current version of the code is the Shenzhen Code adopted by the International Botanical Congress held in Shenzhen, China, in July 2017. As with previous codes, it took effect as soon as it was ratified by the congress, but the documentation of the code in its final form was not published until 26 June 2018; the name of the Code is capitalized and not. The lower-case for "algae and plants" indicates that these terms are not formal names of clades, but indicate groups of organisms that were known by these names and traditionally studied by phycologists and botanists; this includes blue-green algae. There are special provisions in the ICN for some of these groups.
The ICN can only be changed by an International Botanical Congress, with the International Association for Plant Taxonomy providing the supporting infrastructure. Each new edition supersedes the earlier editions and is retroactive back to 1753, except where different starting dates are specified. For the naming of cultivated plants there is a separate code, the International Code of Nomenclature for Cultivated Plants, which gives rules and recommendations that supplement the ICN. Botanical nomenclature is independent of zoological and viral nomenclature. A botanical name is fixed to a taxon by a type; this is invariably dried plant material and is deposited and preserved in a herbarium, although it may be an image or a preserved culture. Some type collections can be viewed online at the websites of the herbaria in question. A guiding principle in botanical nomenclature is priority, the first publication of a name for a taxon; the formal starting date for purposes of priority is 1 May 1753, the publication of Species Plantarum by Linnaeus.
However, to avoid undesirable effects of strict enforcement of priority, conservation of family and species names is possible. The intent of the Code is that each taxonomic group of plants has only one correct name, accepted worldwide, provided that it has the same circumscription and rank; the value of a scientific name is. Names of taxa are treated as Latin; the rules of nomenclature are retroactive unless there is an explicit statement that this does not apply. The rules governing botanical nomenclature have a long and tumultuous history, dating back to dissatisfaction with rules that were established in 1843 to govern zoological nomenclature; the first set of international rules was the Lois de la nomenclature botanique, adopted as the "best guide to follow for botanical nomenclature" at an "International Botanical Congress" convened in Paris in 1867. Unlike modern codes, it was not enforced, it was organized as six sections with 68 articles in total. Multiple attempts to bring more "expedient" or more equitable practice to botanical nomenclature resulted in several competing codes, which reached a compromise with the 1930 congress.
In the meantime, the second edition of the international rules followed the Vienna congress in 1905. These rules were published as the Règles internationales de la Nomenclature botanique adoptées par le Congrès International de Botanique de Vienne 1905. Informally they are referred to as the Vienna Rules; some but not all subsequent meetings of the International Botanical Congress have produced revised versions of these Rules called the International Code of Botanical Nomenclature, International Code of Nomenclature for algae and plants. The Nomenclature Section of the 18th International Botanical Congress in Melbourne, Australia made major changes: The Code now permits electronic-only publication of names of new taxa; the requirement for a Latin validating diagnosis or description was changed to allow either English or Latin for these essential components of the publication of a new name. "One fungus, one name" and "one fossil, one name" are important changes. As an experiment with "registration of names", new fungal descriptions require the use of an identifier from "a recognized repository".
Some important versions are listed below. Specific to botany Author citation Botanical name Botanical nomenclature International Association for Plant Taxonomy International Code of Nomenclature for Cultivated Plants International Plant Names Index Correct name Infraspecific name Hybrid name More general Glossary of scientific naming Binomial nomenclature Nomenclature codes Scientific classification Undescribed species