Observation 164493: Graphidaceae
When: 2014-03-25
Collection location: Sintra, Portugal [Click for map]
Who: zaca
No herbarium specimen

Notes: Here is another example of my poor knowledge of lirelate lichens. When I first look at it seemed to be (beautiful) young specimen of a Graphis (either G. elegans or G. scripta, as far as I know the representatives of that genus here).
Performing the spot tests, the doubt appeared, since the K reaction was clearly bright yellow with no changed to red (as it usually happens with G. elegans; G. scripta is K-).
The microscopy reenforces the doubt about its classification; In fact, though the hymenium looked like that of a Graphis, the spores are less septate (2 to 5 septa) and much shorter than in the species mentioned above, with the following average dimensions: Me = 24.7 × 7.5 um ; Qe = 3.3 (N=35). Moreover, the spores are oblong in shape and some are constricted at septa. I found no non-hyaline spores, which maybe is natural for a young specimen, and in fact there were no free spores on the slide; all the spores observed were forced to leave their asci by pressuring the cover slip.
Therefore, it my belong to a genus closer to Graphis. I have no good key for Graphidaceae in my area. Any idea?

Images

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Chemical reactions;
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Microscopy 1: Apothecial section;
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Microscopy 2: Asci;
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Microscopy 3: Asci & Spores,
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Microscopy 4: Asci & Spores,
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Microscopy 5: Spores.

Proposed Names

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Created: 2014-04-30 19:20:16 CDT (-0400)
Last modified: 2014-04-30 19:20:24 CDT (-0400)
Viewed: 22 times, last viewed: 2016-10-03 12:01:47 CDT (-0400)
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