Algae
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Algae are any of a large and diverse group of photosynthetic organisms. It excludes the land plants. Such organisms range from microscopic unicellular microalgae to seaweeds, multicellular macroalgae
Marine algae growing on the sea bed in shallow waters
Freshwater microscopic unicellular and colonial algae
False-color scanning electron micrograph of the unicellular coccolithophore Gephyrocapsa oceanica
The kelp forest exhibit at the Monterey Bay Aquarium: A three-dimensional, multicellular thallus
Lichen
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A lichen is a hybrid colony of algae or cyanobacteria living symbiotically among filaments of multiple fungus species, along with bacteria embedded in the cortex, or "skin", in a mutualistic relations
Algae
…or euryhaline), psammon, thermophilic, cryophilic, epibiont (epiphytic, epizoic), endosymbiont (endophytic, endozoic), parasitic, calcifilic or lichenic (phycobiont). Some species of algae form symbiotic relationships with other organisms. In these symbioses, the algae supply photosynthates (organic…
Letharia vulpina, wolf lichen, grows like a multiple-branched tuft or leafless mini-shrub, so it has a fruticose growth form.
Flavoparmelia caperata has leaf-like structures, so it is foliose.
Caloplaca marina grows like an orange crust coating the rock, so it is crustose.
Variospora thallincola grows like a crust, and in a pattern that radiates outward from the center, so it has a crustose placodioid growth form.