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21-11-2025 10:47

François Freléchoux François Freléchoux

Bonjour,Peut-être Mollisia palustris ?Trouvée su

21-11-2025 10:50

Mirek Gryc

Hello Please help me identify this little asco.It

21-11-2025 15:22

Vasileios Kaounas Vasileios Kaounas

Found in moss, forest with Pinus halepensis. Dime

21-11-2025 11:52

Jean-Luc Ranger

Bonjour à tous, on voit toujours 2 espèces areni

21-11-2025 10:56

Christopher Engelhardt Christopher Engelhardt

Very small (~0,5 mm) white ascos, found yesterday

29-06-2016 18:06

Elisabeth Stöckli

Bonjour,Trouvé sur branches mortes cortiquées de

14-11-2025 16:26

Marian Jagers Marian Jagers

Hello everyone, On dead wood of Cytisus scoparius

17-11-2025 21:46

Philippe PELLICIER

Bonjour,Récolté sur bois pourrissant de feuillu

20-11-2025 14:14

Mick Peerdeman

Found on the leaves of 'Juglans regia' in the Neth

20-11-2025 13:07

Mick Peerdeman

In January i found these black markings on the dea

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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
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Jacques Fournier, 19-08-2025 16:48
Jacques Fournier
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

Paul Cannon, 19-08-2025 16:55
Re : Strange fungus on rotten Quercus wood in stream
Thank you. You're a star!

Paul