Subsquamulose lichen, on granite.
THALLUS: squamules loosely appressed, 1-2 mm wide, rich shiny brown to olive greenish in shade, margins black with white dust, darker below; section: irregular hyaline necrotic layer on top, cortex with brownish outer layer, algal layer quite thick and continuous, medulla strongly POL+ whitish not clearing in K, very thick dark brown epihymenium-like cortex of round cells below; all K- and C- and I-
APOTHECIA: black, laminal, lecideine; rim black, shiny, prominant, even smooth; disc black, epruinose, flat; exciple dark brown, not at all greenish, round cells; no mature apothecia in my sample unfortunately; paraphyses not conglutinated, very thin, somewhat branched
SPORES: didn’t find any


Lecidea in bottom left corner.
Lecidea in upper right.
Two little Rhizocarpon amid sea of Lecidea.
Rhizocarpon off on right side.
Aspicilia center to left, brown in upper right is Lecidea, and the gray-and-black along bottom to right is Rhizocarpon.
Mostly Aspicilia, brown is Lecidea, little gray-and-black is Rhizocarpon.
Lecanora muralis on left, and Rhizoplaca melanophthalma in center-right, the rest (the brown) is all Lecidea atrobrunnea.
Squamules, at 30×.
Apothecial section, in water, at 100×.
Apothecial section, in water, at 100x, cross-polaraized.
Thallus section, in water, at 400×.

Proposed Names

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Used references: Nash’s Sonoran Flora

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