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crustose lichen, on moss on exposed granite
THALLUS: gently lumpy, rough-textured dull granulose, tan, blackish fine soredia borne under a few upturned margins, K+y, C+r
MEDULLA: white, K+ rose pink faint, KC+ violet briefly
ALGAE: green


at 10x
Soralia at 30×.
Surface at 30×.
Thallus section, at 30×.
excavate soralia
apothecia are very rare
apothecial section in water at 100x
apothecial section in water at 100x, cross-polarized

Proposed Names

-87% (1)
Used references: Nash’s Sonoran Flora
Based on chemical features: see notes
87% (1)
Recognized by sight: Turns out that this population, despite having soralia, has spores far too small to be T. steppica. T. glaucopholis is the correct name, instead. (Thanks to Curtis Björk for patiently prodding me until I finally came around to the truth which was obvious to him right from the start!)

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= Observer’s choice
= Current consensus


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