Observation 190772: Physcia adscendens (Fr.) H. Olivier

Growing on either dead Encelia or Eriogonum. Thallus has odd hairs along the margin? Spot test K+ yellow.

Proposed Names

-34% (2)
Recognized by sight
-62% (2)
Used references: Parmotrema arnoldii seems to have similar hair like structures on the margins, couldnt find anything else similar.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: Jason Hollinger (jason)
2014-12-02 12:36:10 PST (-0800)

I seem to remember that P. tenella doesn’t occur in southern California (ignore the map on CNALH, I don’t think those records are right because maybe P. tenellula is too new of a species, not sure).

Regardless, the thing to look for is the “helmet-shaped” swelling at the lobe tips. In these southern California forms of P. adscendens it’s sometimes really hard to see them. The lobe tips instead disintegrate so quickly into soredia and then turn into flattened, curled-up flaps. Which is how P. tenella/P. tenellula is described. But don’t let that fool you. The key is (I think!) to look for young developing lobes and see what the sorialia look like when they just begin to emerge. There should be distinct swellings above them in P. adscendens, even in forms like this.

P. tenella has a much “leggier” overall form. In my limited experience: I’ve only seen it a few times.

Created: 2014-11-30 23:08:09 PST (-0800)
Last modified: 2014-12-02 10:56:24 PST (-0800)
Viewed: 21 times, last viewed: 2017-06-19 08:39:21 PDT (-0700)
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