Observation 127721: Physcia (Schreb.) Michaux
When: 2013-02-03
(35.5618° -84.2329° 259m)
No herbarium specimen

Notes: On hardwood branch.

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Beautiful photos
By: Jason Hollinger (jason)
2013-02-08 11:58:41 CST (-0500)

Good, I’m glad you’re holding out for chemical verification, because I don’t think the conspicuous maculae work very well in the Smokies. I’ve found small-lobed maculate specimens like this with K- medulla.

Note, according to Brodo there are two additional species in the southeast with K+y medulla, by the way:

P. neogaea — Spores with rounded locules, ack!, and not spotted, at least near the tips.
P. pumilior — Spores with angular locules like P. aipolia, but with narrower convex lobes. It is also spotted like P. aipolia.

Nice photos.
By: zaca
2013-02-03 14:42:23 CST (-0500)

Presuming that the underside is whitish, it must be either Physcia aipolia or P. stellaris.
The former is said to have conspicuous white flecks (pseudocyphellae) while the latter can lack or has only few white flecks. Both react K+ yellow on thallus, but they differ on the K reaction on medulla: K+ yellow for P. aipolia and K- for P. stellaris.

Created: 2013-02-03 13:02:59 CST (-0500)
Last modified: 2013-02-08 11:47:49 CST (-0500)
Viewed: 46 times, last viewed: 2016-10-20 16:37:02 CDT (-0400)
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