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Additional info for A Field Guide to Biological Soil Crusts of Western U.S. Drylands
2-2 mm. Spores mostly 2-celled. Photobiont blue-green (Nostoc). Habitat: On calcareous soils. This species of Collema is more common in the Colorado Plateau region and the Sonoran Desert than in the Great Basin. Chemistry: All spot tests negative. Comments: This is a nitrogen-fixing lichen. Collema coccophorum is commonly the dominant lichen on calcareous soils and commonly grows in a lime-loving community that includes Psora decipiens and Placidium species, although it is often found at lower densities on less calcareous soils.
Aspicilia desertorum form terrestris 3b) Lobes flattened in cross-section, dorsiventral, with margins strongly curled inward almost forming tubes, pale greenish to yellow-green; rhizines present.. Xanthoparmelia chlorochroa F: Foliose Thallus on various substrates, with discrete lobes, foliose or distinctly lobate crustose. 1a) Thallus sorediate, soredia terminal...................................... 2 2a) Lobes greater than 2 mm wide, thallus greenish to gray..................................
It sometimes has pruina on the margins of the lobes. It is readily disturbed by livestock grazing and trampling.
A Field Guide to Biological Soil Crusts of Western U.S. Drylands by Lichen