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This is taken from two observations:

Endolithic lichen, on exposed granite of road cut.
APOTHECIA: small black discs, scattered, lecideine, (0.27)0.39+/-0.07(0.48) mm (N=18)
DISC: black to reddish-black, concave, epruinose, concave to convex
RIM: black, prominant, smooth, becoming thinner and developing a translucent edge in age
EPIHYMENIUM: reddish brown, not at all greenish, K-, sometimes with up to 10 µm hyaline layer on top
HYMENIUM: hyaline to somewhat brownish
HYPOTHECIUM: hyaline to somewhat brownish
EXCIPLE: thin black outer layer from pigment in hyphae walls, not carbonized, grading from brown to hyaline inside
PARAPHYSES: swollen to 5 µ wide at rounded tips, not pigmented
SPORES: many many per ascus, hyaline, smooth, simple, somewhere around 3-4 × 1-1.5 µm (I have better measurements elsewhere)

I have seen this with much larger apothecia before, I think, but I would like to compare the two more carefully before I’d be willing to say the other observation (observation 7219) is the same species for sure.


at 10x
at 30x
apothecial section, in water, at 100x
exciple, in water, at 400x
spores, in water, at 1000x

Proposed Names

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

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= Observer’s choice
= Current consensus


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