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Francis Maggi

Bonjour,Trouvé sur Xanthoria parietina à Valdebl

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Peter Welt Peter Welt

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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