Burkhard Büdel

Peltula is a genus of small dark brown to olive or dark grey squamulose lichens. These lichens typically grow on rocks in arid and semi-arid environments worldwide. They consist of a fungus living in symbiosis with a photosynthetic partner, specifically a cyanobacterium of the genus Chroococcidiopsis. Peltula is the only genus in the family Peltulaceae, which belongs to the Lichinomycetes, a class of fungi that form lichens. The genus includes about 50 recognised species, which have a variety of growth forms ranging from flat and crust-like to more complex, leaf-like structures. Peltula

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Pseudopeltula necrocorticata is a species of cyanolichen in the family Lichinaceae. It forms small, yellowish-olive, scale-like lobes up to about 3.5 mm across on rock and gravel in desert habitats. The species is unusual in having a surface layer formed partly from dead cyanobacterial cells, which gives rise to its name. It is known from the Sonoran Desert region of northwestern Mexico, where it may be overlooked because it resembles small species of Peltula.

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