Notes: Growing on calcareous rock in the intertidal zone; the rock becoming half submersed at the higher level of the sea (see the photo of the habitat).
These specimens are very similar to the ones considered at observation 107664 more than three years ago at the same place and I believe to be of the same species.
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sum(score * weight) /
(total weight + 1)
The microscopy confirmed that this is an Opegrapha sensus lato. The spores are hialine, 3-septate, with the following dimensions:
(13.3) 14.8 – 19.6 (26) x (3.8) 4.1 – 5.5 (6.2) µm
Q = (2.8) 3 – 4.2 (5.9) ; N = 29
Me = 17.5 × 4.8 µm ; Qe = 3.7 .
These values are a bit lower than those given in the British Flora for Alyxoria subelevata, that was my initial guess. However, I didn’t find any species with these features as alternative to that one.
Created: 2015-09-27 01:24:07 CEST (+0200)
Last modified: 2015-09-28 22:20:09 CEST (+0200)
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