As a result of the microscopy I conclude that this species has a variable number of spores per ascus (many with 2, some with 3 and other with more, being difficult to say how many) – see the photos attached. I obtained the following average values for the dimensions of the spores:
Me = 106.8 × 37.8 µm ; Qe = 2.8 (N = 30).
In Group 17 of Key to Pertusaria, corresponding to species with 2-4 spores/ascus there are 3 species living in Europe: P. leucostoma (taking as a synonym of P. leioplaca), P. caesioumbrina (with shorter spores) and P. coronata (this one being isidiate). Only the 1st one has a variable number of spores per ascus, the others have 4 spores/ascus.
On the other hand, following the steps of the key Pertusaria in Europe and the Mediterranean :1-2-3b-8-47-48b, one gets the same result: P. leucostoma (= P. leioplaca).
Some photos of P. leioplaca and of its microscopy can be seen in azores bioportal.
Average dimensions of the spores:
Me = 106.8 × 37.8 µm ; Qe = 2.8 (N=30).
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Created: 2011-09-05 17:22:22 CDT (-0500)
Last modified: 2011-09-05 18:46:57 CDT (-0500)
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