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Notes:
crust lichen, on granitic rock
THALLUS: dark gray, areolate, K-
MEDULLA: white
ALGAE: green
APOTHECIA: ~1 per areole, sunken, disk black, epihymenium greenish brown turning pure brown in K, hymenium clear, hypothecium clear, asci with K/I- thickened tip, paraphyses narrow & anastomosing & with about 4 swollen cells at end
SPORES: 8 per ascus, elliptical, smooth, around 20-25 × 12-14 µm, clear, simple

Clearly keys to A. confusa (common) or A. fumosa (not common): former has concolorous to white-lined rims and spores 19-27 × 11-16 µm; latter has olive to brown contrasting rims and spores 18-22 × 10-14 µm. Otherwise
they are essentially the same. Mine is clearly the former. This is also reputedly common in southern California mountains.

Images

at 10x
at 30x
apothecial section, in water, at 100x
apothecial section, in water, at 100x, cross-polarized
apothecial section, in K, at 100x

Proposed Names

87% (1)
Used references: Nash’s Sonoran Flora
Based on microscopic features
Based on chemical features: K-

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= Observer’s choice
= Current consensus

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