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Additional info for A Field Guide to Biological Soil Crusts of Western U.S. Drylands
Spores 8 per ascus, single-celled, colorless. Photobiont green (Trebouxia). Habitat: Common on loamy to sandy soils Especially common on non-calcareous to mildly calcareous soils of the Colorado Plateau. Chemistry: C-, K-, KC- or KC+ yellow-orange (usnic acid), P-. Comments: This species may take on a very fragile, creeping, fruticose growth form on non-calcareous, very sandy soils where it can be very abundant. Sometimes it appears as if it is peeling away from the substrate. The form found only on rock is form desertorum and is more continuous crustose and is frequently fertile.
5 mm diameter, flat to convex. Margin thin and black, often disappearing in maturity, attached to the substrate. Exciple uniformly pigmented dark brown. Spores 8 per ascus, dark, mostly 2-celled (or more), 11-16 × 6-8 µm, cell walls not constricted. Photobiont green (Trebouxia). Habitat: Twigs and bark of old wood are preferred habitats, but it can also be found on rock, soils and organic matter. Chemistry: All spot tests negative. Comments: Buellia punctata in aridlands is mostly found on organic matter, unlike B.
Habitat: Common on gypsiferous soils in the cool deserts, coastal Sonora and southern California grasslands and chaparral but may occur on various soils farther south and east. Chemistry: C+ dark red, K+ yellow to purple, KC+ red, P-. Comments: Diploschistes diacapsis is an excellent gypsum indicator in the Colorado Plateau region. It can occasionally form very impressive large populations and may dominate local areas. It typically co-occurs with Psora decipiens, Fulgensia bracteata, and Squamarina lentigera.