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Observation 11646: Rinodina (Ach.) Gray

Notes:
crust lichen, on sandstone
THALLUS: endolithic
APOTHECIA: black, small, separate, adnate to stipitate, lecanorine; rims v thin almost disappearing, ragged whitish-gray, K-; disc black, epruinose, becoming convex; epihymenium brown, small amount of tiny POL+ white granules; hymenium clear; hypothecium clear to faint golden; exciple negligible??; paraphyses many branched at tips, last several cells inflated w/ brown pigmented caps, not strongly stuck together
SPORES: 8 per ascus, elliptical, clear becoming gray becoming dark brown, smooth, 2 cells, rounded lumina with thick apex and less thick walls when young, losing thickened walls in age, dark band of pigment around waist, waist slightly constricted even in K, (18)24+/-3(32) x (8.3)10+/-1(13) µm (N=18)

Can’t get this one to key out the Sonoran Flora. I tried both Rinodina (given the clear hypothecium) and Buellia to no avail.

Images

at 10x
at 30x
apothecial section, in water, at 100x
apothecial section, in water, at 100x, cross-polarized
close-up of exciple, in water, at 400x
collage of spores, in water, at 1000x

Proposed Names

87% (1)
Used references: Nash’s Sonoran Flora

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= Observer’s choice
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