Average dimensions of the spores: Me = 23.4 × 10.2 µm ; Qe = 2.3 (N=20).
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sum(score * weight) /
(total weight + 1)
Could make this P. nitida instead of P. occidentalis… but I see the range is incorrect (avoids oceanic areas). As I’m sure you already know, your spore size matches P. occidentalis, being slightly too wide for P. nitida and P. laevigata. The only other one that seems promising is P. macrospora, which has spores > 27µm long. That exhausts the British Flora.
Two points to help confirm: P. occidentalis has an orange pigment (K+ deep wine red) scattered on outer surface, especially of the perithecia, spot test apparently visible in cross-section. Also the hymenium is is strongly inspersed with tiny oil drops making it appear cloudy.
But there are a number of additional observations that would help verify your id: are the spores colorless or dark?; muriform or with just a few septae?; exciple dark all the way around or more strongly pigmented on the sides and poorly pigmented below?; is anything in the hymenium or exciple K+ purple-red under the microscope?
You probably have the answer to a number of these already.
Created: 2012-03-26 18:41:38 EDT (-0400)
Last modified: 2012-03-26 18:41:41 EDT (-0400)
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