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It could be confused with other large white lichens with dark apothecia, such as Psora cerebriformis, Diploschistes diacapsis, and Lecanora gypsicola. Acarospora nodulosa var. nodulosa is clearly squamulose with lobate squamules and large, flat, immersed, brown-black apothecia. Psora cerebriformis has a brain-like, hemispherical thallus and small, convex, black apothecia. Diploschistes diacapsis is a thick, crustose lichen with numerous crater-like, dark gray apothecia. Elevation Lecanora gypsicola has a chinky, crustose thallus, and only 8 large 4,000 spores per ascus.

6 33 6a) Thallus erect, basally attached; branches terete with laminal pseudocyphellae................................................................... Aspicilia hispida 6b) Thallus more or less of compressed mats, attached at several points along the lobes; lacking pseudocyphellae........................................... 8 8a) Thallus predominantly narrow, elongate and stringy; margins well defined, discrete; lobe tips sharply pointed and distinct from the main thallus, often black with forked tips, thallus Kor weakly K+...............................................

2 2a) Lobe margins with tiny white hairs; fairly common, often on soils and mosses................................................................... Leptochidium albociliatum 2b) Lobe margins lacking tiny white hairs............................................................. 3 3a) Thallus dull and smooth or coarsely wrinkled under a hand lens, lacking a cortex; margins of lobes swollen or nodulose (with minute lumps) but not fringed; often with abundant isidia.............................................................

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A Field Guide to Biological Soil Crusts of Western U.S. Drylands by Lichen


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