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Comments: This is a nitrogen-fixing lichen. Widespread but seldom common, this late successional species is less frequent in arid deserts than in the more moist Great Basin sites and grassland habitats. It is an old growth indicator in aridlands. It has a distinctive chocolate-brown color and, once seen, is easy to identify. It sometimes has pruina on the margins of the lobes. It is readily disturbed by livestock grazing and trampling.

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.

Coccophorum are 2-celled. 3,500 3,000 2,500 2,000 1,500 1,000 500 Meters 56 Diploschistes diacapsis Common name: Desert crater lichen Synonyms: Diploschistes albissimus, Urceolaria albissima Description: Thallus very thick, crustose, light gray due to heavy pruina, often with an undulating appearance, greater than 5 cm diameter. 5 mm diameter. Rhizines lacking. 5 mm) and immersed, black or pruinose gray. Spores 4-8 per ascus, many-celled, 20-38 × 9-17 µm. Photobiont green (Trebouxia). 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.

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