Observation 108513: Lecanora albella (Pers.) Ach.
When: 2012-09-01
Who: zaca
No herbarium specimen

Proposed Names

29% (1)
Based on chemical features: C-, K+ yellow, KC+ yellow with traces of red.
58% (1)
Eye3 Eyes3
Used references: See the comments and Smith et al., The Lichens of Great Britain and Ireland, The British Lichen Society, 2009.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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I love those rare Lecanora species
By: Jason Hollinger (jason)
2012-09-04 11:57:07 PDT (-0700)

that you can ID confidently from sight. I would only caution that there are additional look-alike species in other parts of the world, e.g., L. caesiorubella. Some might occur in Portugal. But I think with the P test and spore measurements, we can rule out even those. Good work!

You are absolutely right.
By: zaca
2012-09-04 11:01:58 PDT (-0700)
I should had recognized the similarity with the one in observation 77854, but this time the thallus was so small and cracked that it was difficult to infer details from its observation. Following your comment I applied the key of the British Flora and the result is that you mentioned, in the following steps:

1. Thallus crustose, margins not lobe-like in surface view;
5. Soredia absent;
25. On bark;
26. Thallus white, grey, without yellow tones;
38. Thallus and/or exciple or discs Pd+ deep yellow to orange or red [observed: Pd- on thallus and Pd+ yellow/orange on discs];
39. Ascospores exceeding 4 um in width [dimension observed: ~ 10-12 × 7.5-8.5 µm];
40. Apothecial discs pinkish-rose to pale brown, densely pruinose, Thalline exciple becoming excluded:

—> Lecanora albella.

Moreover, comparing with the detailled description of the species in the British Flora it seems a perfect match.
I already uploaded some of the new data.

Heavy pruina and chemistry really narrow it down
By: Jason Hollinger (jason)
2012-09-03 18:04:37 PDT (-0700)

By my reading of the British Flora, L. albella is your only choice(!)

Created: 2012-09-03 17:33:29 PDT (-0700)
Last modified: 2012-09-04 12:29:27 PDT (-0700)
Viewed: 28 times, last viewed: 2016-10-28 01:51:54 PDT (-0700)
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