Observation 72819: Acarospora A. Massal.

When: 2011-07-28

Collection location: Davis, California, USA [Click for map]

Who: Byrain

Specimen available

Growing in an exposed spot on an old stone bridge, I suspect this to require microscopy so I will look at it soon, advice & tips would be very much appreciated.



Proposed Names

28% (1)
Recognized by sight
56% (1)
Recognized by sight: Looks to be in the badiofusca group, with thick shiny dark brown thallus. The Sonoran Flora keys it to “section four” (cortex/medulla C+ red) and “section five” (C-) based on this alone, with ~7 species in each section. Do a thin section of one of the areoles through an apothecium, and note whether the green algal layer is continuous under the apothecium; note spore size and shape, thickness of paraphyses at the base. That should be enough. We can assume that a man-made stone bridge, probably with cement involved, is calcareous — that is also critical information.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2011-07-28 22:30:31 CDT (-0400)
Last modified: 2011-07-29 13:18:44 CDT (-0400)
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