Observation 12285: Lecanora Ach.

crust lichen, on granite
THALLUS: light gray, not yellowish at all, strongly verruculose, areolate, K+y, C-
APOTHECIA: lecanorine, width (1.3)1.8+/-0.3(2.4) mm (N=10), strongly constricted to subpedicillate (lower cortex nearly complete); rim like thallus, almost squamulose; disc orangish brownish, lightly pruinose, convex when young becoming strongly convex; epihymenium brown, POL+ white small crystals, crystals and pigment dissolve in K, C-; hymenium clear; hypothecium clear, small POL+ white crystals present dissolving in K; amphithecium cortex present with small POL+ white granules dissolving in K, algae almost continuous in two layers (both a layer immediately below hypothecium and a layer next to lower cortex), large POL+ white crystals not dissolving in K; paraphyses clear, simple, long and narrow, minutely abruptly swollen rounded tips
SPORES: 8 per ascus, ellip, clear, simple, (12)14+/-2(18) x (4.4)6.3+/-0.9(8.2) µm (Q=(1.8)2.3+/-0.2(2.8)) (N=17)

This is very clearly not in the Sonoran Flora. Not necessarily surprising considering no one has collected on Mt. Wilson really since Hasse was here in the first half of the 1900’s. But without access to any monographs on Lecanora, I have no way of knowing whether this is an undescribed species or something that occurs in, say, Europe or elsewhere in North America.


at 10x
at 30x
Apothecial section, in water, at 100×.
Cool! Apothecial section, in water, at 100x, cross-polarized.
Apothecial section, in K, at 100×.
Apothecial section, in K, at 100x, cross-polarized.
Asci with spores, in K, at 1000×.
Spores, in K, at 1000×.

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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Created: 2008-10-10 11:25:36 PDT (-0700)
Last modified: 2008-10-10 11:25:36 PDT (-0700)
Viewed: 56 times, last viewed: 2020-05-22 03:55:12 PDT (-0700)