When: 2008-06-08

Collection location: Plateau above Echo Cliffs, Coconino Co., Arizona, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

crust lichen, on exposed sandstone
THALLUS: endolithic and completely invisible
APOTHECIA: 1-1.5 mm wide, black, gyrose-roughened, v tough, epihymenium carbonized and black to dark brown, hymenium red-brown to light golden brown, hypothecium opaque, paraphyses invisible and strongly stuck together even in KOH, all K-
SPORES: hugely many per ascus (hundreds?), clear, simple, smooth, 6+/-1 × 2.5/-0.2 µm (Q=2.3/-0.4) (N=6)

The rather large, black, conspicuously roughened (use hand lens), and complete lack of thallus distinguish this relatively common sandstone lichen. It often causes soft sandstone to flake.


magnification 10x
magnification 30x
apothecial section showing thick carbonized epihymenium, in water, at 400x
polysporous acsi and spores, in water, at 1000x

Proposed Names

87% (1)
Used references: Nash’s Sonoran Flora
Based on microscopic features

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= Observer’s choice
= Current consensus


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Created: 2008-09-13 08:43:46 EEST (+0300)
Last modified: 2008-09-13 08:43:46 EEST (+0300)
Viewed: 48 times, last viewed: 2019-04-30 11:35:39 EEST (+0300)