Bonjour tous
I recently collected a decorticated narrow branch (Salix?/Betula?) well covered with a gregarious pyrenomycete; microscopical examination showed it to be a Coniochaeta. It is in excellent sporulating condition; and yet the spore measurements are confusing and do not sit well with any descriptions I have looked at, including the table in Coniochaeta extramundana, with a Synopsis of Other Coniochaeta Species D. P. Mahoney and J. S. LaFavre in Mycologia, Vol. 73, No. 5, pp. 931-952.
The ascospore measurements are (8.6)9.3-11.5 x (5.3)5.5-5.9(6.3)µm; the spores are generally similarly shaped, ellipsoid and not distinctly flattened, with the Q ratio a steady 1.6-1.7 (mostly the latter). The perithecial hairs are relatively short, the longest seen being around 30µm.
Perhaps the closest match is Coniochaeta subcorticalis, but while I am reasonably au fait with coprophilous Coniochaeta, I have little experience of lignicolous species.
Any suggestions would be much appreciated

Cordialement
Chris