Observation 91477: Pyrrhospora quernea (Dickson) Körber
When: 2012-03-25
Who: zaca
No herbarium specimen

Notes: In spite of the distinctive chemical reactions I was not able to find even the genus for this specimen.

Proposed Names

-3% (2)
Recognized by sight
28% (1)
Recognized by sight: see comment

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Just doesn’t look like Pertusaria to me
By: Jason Hollinger (jason)
2012-04-02 00:25:49 CEST (+0200)

Pertusaria usually have distinctive thick creamy thalli, usually with discrete concolorous soredia if sterile. This has a thin shiny white hypothallus totally covered with contrasting green soredia. In the British Flora, the sorediate ones mentioned are: P. hemisphaerica (C+r), P. multipunctata (soredia confined to apothecia), P. pupillaris (punctiform soralia, C-), P. borealis (discrete soralia, KC-), P. ophthalmiza (KC-), P. amara (which you know well).

Talking about possibilities …
By: zaca
2012-04-02 00:12:25 CEST (+0200)

why not one of the yellowish Pertusaria: P. flavida and P. flavicans?
The problem with the C reaction is the same, not yellow but yellow going to orange/red.

Some options
By: Jason Hollinger (jason)
2012-04-02 00:05:17 CEST (+0200)

It looks sort of C+ orange, suggesting presence of xanthones. Try Pyrrhospora quernea and Micarea xanthonica. However xanthones should just be C+ and KC+ orange, not KC+ red. The British Flora also suggests Micarea viridileprosa with gyrophoric, saying that the C test will often turn orange rapidly due to “rapid hydration of the green photobiont”. Both Micarea should have thalli entirely composed of “goniocysts”; I doubt yours can be described thus. But worth checking. There are also several species of Lecidella and Lecanora with C+ orange test: Lecanora expallens, L. alboflavida, Lecidella flavosorediata, L. pulveracea, L. subviridis, L. elaeochroma f. soralifera, and L. scabra. All should, however, have more discrete soralia than I see. I think P. quernea looks the most promising. (In my personal notes, I have it written down as “C+ orange, KC+ orange/red”. That’s from material found in coastal southern California.)

Created: 2012-04-01 23:45:58 CEST (+0200)
Last modified: 2012-08-21 12:02:36 CEST (+0200)
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