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It is often called 'stomach icecream'. Rock tripe (Umbilicaria spp. and Lasallia spp.) is a lichen that has frequently been used as an emergency food in North America. One species of Umbilicaria, Iwa-take (U. esculenta), is used in a variety of traditional Korean and Japanese foods. It is quite expensive, and is collected off the sides of cliffs.
The fungi of some lichen species may "take over" the algae of other lichen species. [16] [135] Lichens make their own food from their photosynthetic parts and by absorbing minerals from the environment. [16] Lichens growing on leaves may have the appearance of being parasites on the leaves, but they are not.
Usnea filipendula – one of about 20,000 described species of lichen. The following outline provides an overview of and topical guide to lichens.. Lichen – composite organism made up of multiple species – a fungal partner, one or more photosynthetic partners, which can be either green algae or cyanobacteria, and, in at least 52 genera of lichens, a yeast. [1]
In identification key reference literature, the outcome of chemical spot tests serves as a primary characteristic for determining the species of lichens. There are several other less frequently used spot tests of more limited use that are employed in specific situations, such as to distinguish between certain species.
This is a list of common names of lichen genera. When a common name for a lichen genus is the same as the scientific name for that genus, it is not included in the following list. This list only includes genera common names that are widely used, as indicated by the common name either appearing in a peer reviewed scientific publication or in a ...
The latter, which are found only in foliose lichens, come in a variety of shapes, the specifics of which can aid in species identification. [36] Some foliose lichens attach only at a single stout peg called a holdfast, typically located near the lichen's centre. Lichens with this structure are called "umbilicate". [31]
Study of lichens draws knowledge from several disciplines: mycology, phycology, microbiology and botany. Scholars of lichenology are known as lichenologists. Study of lichens is conducted by both professional and amateur lichenologists. Methods for species identification include reference to single-access keys on lichens.
Arthonia radiata is a crustose lichen with an immersed thallus, often separated from its surroundings by a thin brown line.The thallus is typically pale, ranging from white to pale grey, sometimes with a brown or olive tinge, and often forms a mosaic-like pattern on its substrate.