Observation 98727: Psora decipiens (Hedwig) Hoffm.
When: 2012-06-30
Who: zaca
No herbarium specimen

Notes: Growing on soil at the base of a calcareous rock.
At first sight this specimen is very similar to Gyalecta jenensis and maybe belongs to it. However, having read the description of this species in “CNALH” and a short description in “Irish lichens”, no mention to pruinose apothecia (that my specimen presents) is made. Thus I will wait for an oportunity to look at the spores to go to the species level. Another curiosity of this specimem is that no thallus is visible seeming that there is another lichen (something like a Lecidomma) scrambled with it, and some of its apothecia can be seen in the photos. On the other hand, some apothecia of the Gyalecta are parasitesed.

Proposed Names

19% (2)
Used references: CNALH, Irish lichens.
Based on chemical features: All chemical reactions negative.
84% (1)
Recognized by sight: These are squamules, not apothecia. Your photos look identical to Sharnoff’s, so much so I did a double-take to make sure I wasn’t actually looking at yours. :)
Based on chemical features

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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In fact, you solve the problem …
By: zaca
2012-06-30 19:12:00 BRT (-0300)

The similarity with the Sharnoff photos is perfect. Thus the apothecia that I thought to belong to another lichen are actually their one apothecia. I didn´t knew either species. Thanks, Jason.

Created: 2012-06-30 18:47:49 BRT (-0300)
Last modified: 2012-06-30 18:59:50 BRT (-0300)
Viewed: 33 times, last viewed: 2016-10-23 05:54:54 BRST (-0200)
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