Observation 11054: Polysporina cyclocarpa (Anzi) Vězda
When: 2008-06-08
Herbarium specimen reported

Notes: 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.

Images

21304
magnification 10x
21305
magnification 30x
21306
apothecial section showing thick carbonized epihymenium, in water, at 400x
21307
polysporous acsi and spores, in water, at 1000x

Proposed Names

87% (1)
Eye3 Eyes3
Used references: Nash’s Sonoran Flora
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-09-13 01:43:46 EDT (-0400)
Last modified: 2008-09-13 01:43:46 EDT (-0400)
Viewed: 39 times, last viewed: 2016-06-21 10:21:19 EDT (-0400)