Observation 11646: Rinodina

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.


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)
Eye3 Eyes3
Used references: Nash’s Sonoran Flora

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2008-09-27 18:03:18 CDT (-0500)
Last modified: 2008-09-27 18:03:18 CDT (-0500)
Viewed: 40 times, last viewed: 2017-06-05 02:52:08 CDT (-0500)