Observation 70622: Pyxine sorediata (Ach.) Mont.
When: 2011-06-25
Who: zaca
No herbarium specimen

Notes: This one is completely different from what I observed before. Here are some features:
- the more remarkable is the “frosted” zone near the margin of thallus;
- the lobes are almost flat at the center and concave at the margin;
- sorediate, mainly at the center of thallus.
According to CNALH the above mentioned “frosted” zone is a distinguish feature of P. undulata. I didn’t find conclusive photographs. Can it be this species?

Proposed Names

29% (1)
Eye3
Used references: CNALH
56% (1)
Eyes3
Recognized by sight: distinctive pattern of pruina on lobe tips but not on margin; coarse soredia

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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I should …
By: zaca
2011-07-01 10:11:31 PDT (-0700)

… have recognized that with these lobes could not be Physcia. Thankfully, Jason corrected me.

Perfect example of Pyxine
By: Jason Hollinger (jason)
2011-06-30 17:44:45 PDT (-0700)

There is at least one other species (P. subcinerea) very similar to this which can be distinguished by having a UV+ yellow cortex. If you scratched either open, you should see a strongly mustard-yellow colored medulla.

Created: 2011-06-30 16:45:31 PDT (-0700)
Last modified: 2011-06-30 17:41:28 PDT (-0700)
Viewed: 37 times, last viewed: 2016-10-24 20:51:48 PDT (-0700)
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