pyreno on Fraxinus - Forum ASCOFrance

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pyreno on Fraxinus

Andreas Millinger, 20-05-2026 20:08

Good evening,

another quite distinctive find from March on a log of Fraxinus in the gorge:
The spores are quite variable in shape and have [ 12.8-14.7-17.6 ] x [ 3.8-4.4-4.9 ] Q = [ 2.7-3.4-4.1 ] N = 13. Asci 8 spored, uniserate, IKI-, Paraphysis 1.5-2.5 thick

Thank you very much for help!
andreas

Gernot Friebes, 20-05-2026 20:24

Re : pyreno on Fraxinus

Hi, Andreas!

It reminds me of Biporispora europaea. Please check if the ends of the ascospores have germ pores.

Best wishes,
Gernot

Andreas Millinger, 20-05-2026 20:42

Re : pyreno on Fraxinus

Hi Gernot,

thank you for your answer!
Pictures are not very good, however I think that the middle spore on top look like a pore.

Try to find the exsicate for better docs...

andreas

Andreas Millinger, 20-05-2026 22:00

Re : pyreno on Fraxinus

Hi Gernot,
found exsiccate and made some pics from spores and dissolved Stroma in KOH 30%.
Asci measurement [ 91.3-98.7-104.1 ] x [ 5.8-6.2-6.6 ] Q = [ 14.1-15.9-17.9 ] N = 6
The germ pores are hard to see, but I found some hints (see pics).
I think this fits very well to Stefan Blasers post
http://www.ascofrance.com/search_forum/74290
and
D. Rogers, Yu-Ming Ju (1999): Biporispora europaea gen. et sp. nov., a new pyrenomycete from France. In: Nova Hedwigia, 68 3-4, 421-424.