Observation 201871: Acarospora A. Massal.

When: 2015-03-23

Collection location: Cholame Valley, California, USA [Click for map]

35.8557° -120.3052° 523m

Who: J-Dar

No specimen available

Proposed Names

-31% (2)
Recognized by sight
56% (1)
Recognized by sight
28% (1)
Recognized by sight: just because it’s by far the most common, and it often is this squamulose

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I’d stick with Acarospora on this
By: Jason Hollinger (jason)
2015-03-26 11:18:38 EDT (-0400)

Admittedly, the difference between the two genera isn’t nearly as obvious as one would like. But Pleopsidium should never become so squamulose with imbricate squamules.

The “final test” is to check if the ascus stains, but that’s a very subtle test (even as ascus stains go!), and in Acarospora the cortex is usually formed of tightly-packed globose cells (“paraplectenchymatous”), versus Pleopsidium which has elongate intertwined cells (“prosoplectenchymatous”), also a subtle character which really requires studying the two side-by-side a few times, I find, before you can grow confidence.

Created: 2015-03-26 10:10:15 EDT (-0400)
Last modified: 2015-03-26 11:14:29 EDT (-0400)
Viewed: 31 times, last viewed: 2017-06-20 01:09:39 EDT (-0400)
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