Observation 204823: Physconia americana Essl.

When: 2015-05-21

Collection location: Paso Robles, California, USA [Click for map]

35.6282° -120.8831° 1150m

Who: J-Dar

No specimen available

On Valley Oak (Quercus lobata) bark in mixed oak forest at intersection of Klau Mine Road and Dodd Road.

Thallus grey, lobes pruinose, K- upper cortex, underside pale, rhizines black, squarrose and dense, apothecia pruinose with lobules on margin (new photos added, green due to being wet).


Apothecia lobules
Apothecia closeup

Proposed Names

-61% (2)
Recognized by sight
92% (2)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Hasty specimen review!
By: J-Dar
2015-05-23 10:22:23 PDT (-0700)

Sorry for that, not sure what happened but I surely did not look at it and made an odd choice based on a photo I saw somewhere. All features point to P. americana, thanks!

Note the little lobules around the apothecia
By: Jason Hollinger (jason)
2015-05-22 21:20:45 PDT (-0700)

Very typical of this species. Note that K- cortex should rule out Physcia, unless you meant the medulla was K-? Still, dense pruina, dense black rhizines, lobules, all point to Physconia americana

Created: 2015-05-22 20:42:44 PDT (-0700)
Last modified: 2015-05-23 10:20:58 PDT (-0700)
Viewed: 44 times, last viewed: 2017-06-20 01:34:00 PDT (-0700)
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