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crust lichen, on exposed calcareous rock on top of Valencia Peak (near sea)
THALLUS: lobate, lobes 0.5-1.5 mm wide, v deeply cracked, convex to warty, pale tan to brown, darker at margin, densely light pruinose, cracks dark to almost black despite medulla being white, K-, C-, KC-
MEDULLA: white, K-, C-, KC+ pink faint and brief
ALGAE: green
APOTHECIA: immersed to flush, black, flat to v convex, to 0.4 mm wide, no exciple(?!); epihymenium gray-brown; hymenium clear, ~50 µm tall; hypothecium dark brown
SPORE: 8 per ascus, gray, 10 × 6-7 µm, septate, slightly constricted at septum, walls evenly thickened


at 30x
at 30x
mature spores, in water, at 400x

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
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