Notes:
Crustose lichen, on oak bark, around 4000’.
THALLUS: whitish greyish, verruculose
MEDULLA: white
APOTHECIA: big with thick raised thalline margin, epihymenium and medulla C+ pink, UV-

Images

Just a thumbnail.
Also some Melanelia and probably Rinodina in there.

Proposed Names

87% (1)
Used references: Nash’s Sonoran Flora
Based on chemical features: Disc and medulla C+ pink.

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= Observer’s choice
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