Cetraria
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Cetraria is a genus of fruticose lichens that associate with green algae as photobionts. Most species are found at high latitudes, occurring on sand or heath, and are characterised by their "strap-lik
Historical illustration of Cetraria islandica from Köhler's Medicinal Plants (1887), showing thallus morphology and anatomical details. This species serves as the type species of the genus Cetraria.
The small-toothed Iceland lichen, Cetraria odontella
The spiny lobes edges characteristic of the genus are evident in this herbarium specimen of Cetraria laevigata.
Cetraria sepincola
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Cetraria sepincola, the chestnut wrinkle-lichen, is a species of foliose lichen in the family Parmeliaceae. It forms compact, cushion-like colonies typically 0.5–2 cm high, with a yellowish-green to d
Growing on dwarf mountain pine (Pinus mugo) in Slovakia