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Ethan CrensonHi all, Here is what I believe to be a Hymenoscyp

12-08-2025 19:44
Could someone send me a pdf copy of this article?S

18-08-2025 15:17

... on 6.7.25 in a subarctic mire near a small lak

18-08-2025 15:07

.. 20.7.25, in subarctic habital. The liverwort i

19-08-2025 16:27
Paul CannonHello all I have spent some time trying to work o

18-08-2025 22:59
Yanick BOULANGERBonsoirVoici un asco récolté le 08/08/2025Comme

18-08-2025 16:01

.. on water-soaked Betula wood lying in a small st

18-08-2025 15:35

.. in subarctic forest at side of small stream, ac
Strange fungus on rotten Quercus wood in stream
Paul Cannon,
19-08-2025 16:27
Hello all
I have spent some time trying to work out what this is, without success. The ascomata are either strongly cupulate discs or (probably) hemiangiocarpic ascomata with broad ostioles, superficial on rotten wood accompanying a pink Orbilia. They are around 150 µm diam. and thin-walled with small globose cells that are heavily melanized, making their structure obscure. The hamathecium is of cellular pseudoparaphyses (I think) that tend to break down at maturity, with the apices forming a brownish epithecium. The asci are clavate to saccate and almost sessile, without any clear apical structures, and the ascospores are 22-24 x 7-8 µm, colourless and 1-septate, without any clear sheath.
Any suggestions would be gratefully received.
Paul
Jacques Fournier,
19-08-2025 16:48

Re : Strange fungus on rotten Quercus wood in stream
Hello Paul,
going aquatic? You are right, it's full of treasures.
I guess you found a Minutisphaera and I agree it's puzzling the first time. You can find information on the genus in
Freshwater Ascomycetes: Minutisphaera (Dothideomycetes)
revisited, including one new species from Japan
Mycologia, 105(4), 2013, pp. 959–976. DOI: 10.3852/12-313.
Your spores seem too small for M. japonica which is fairly common in France. Maybe M. fimbriata that I found once, but since this time new species could have been added.
Good luck!
Jacques
going aquatic? You are right, it's full of treasures.
I guess you found a Minutisphaera and I agree it's puzzling the first time. You can find information on the genus in
Freshwater Ascomycetes: Minutisphaera (Dothideomycetes)
revisited, including one new species from Japan
Mycologia, 105(4), 2013, pp. 959–976. DOI: 10.3852/12-313.
Your spores seem too small for M. japonica which is fairly common in France. Maybe M. fimbriata that I found once, but since this time new species could have been added.
Good luck!
Jacques
Paul Cannon,
19-08-2025 16:55
Re : Strange fungus on rotten Quercus wood in stream
Thank you. You're a star!
Paul