Observation 209969: Physcia (Schreb.) Michaux
When: 2015-07-11
Who: zaca
No herbarium specimen

Notes: I have another puzzle to solve and any help will be appreciated. I found a group of specimens growing on a cherry tree. They all may belong to the same genus – Physcia, but the last two can belong to another genus, a possibility being Pyxine. They are chronologically ordered and will be considered in subsequent observations. I also include a comparative set of photos with all the specimens. Unfortunately I didn’t took any sample (except for the one in _observation 209970) or made any spot test, maybe because in the field they all look (wrongly) familiar.

Images

538297
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538298
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Comparision between specimens in different observations.

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Comments

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So, I´m in good company …
By: zaca
2015-07-14 12:54:56 EDT (-0400)

My doubts started with 209970, which is much more wrinkly and has more convex lobes than the usual specimens of either P. aipolia or P. stellaris. Continuing with 209971, which as you say looks like _Physconia, but that I was unable to recognize. At the end, for me 209972 look very much like Pyxine and not Physconia, though specimens in either genera have more flat or slightly concave lobes. Note, however, that in this location Physconia are very abundant and I never found here any Pyxine sp..
Thanks, Jason, for the comment.

My first reaction
By: Jason Hollinger (jason)
2015-07-14 12:26:04 EDT (-0400)

is that the bottom two (209971 and especially 209972) maybe Physconia. I wouldn’t be surprised if 209969 and 209970 are the same species, something like Physcia stellaris or Physcia aipolia.

I personally find that I frequently guess the genus wrong(!) in the field, especially in arid habitats. I am frequently surprised to find spot tests turning out “wrong” when I put the specimens under the scope. Embarrassing, but I’m sure I’m not alone.

Created: 2015-07-14 10:42:36 EDT (-0400)
Last modified: 2015-07-14 11:10:37 EDT (-0400)
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