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41. Psora
icterica [jaundiced]. |
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A soil
lichen with a distinctive green thallus and black, convex
apothecia. This grows in areas of heavy clay soil on the plains of
Colorado, Texas, and New Mexico. It surprisingly reappears in
southern South America! |
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42. Usnea
cavernosa [with cavities]. |
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A long
hanging species with a thallus often over a foot long, on conifers
in the most moist sites in the mountains, often where fog hangs
along the sides of the slopes. The thallus is smooth, without
soredia, and the thicker branches have characteristic depressions
or dents in the surface. |
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