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02-12-2025 18:59

Round spores asco
Malcolm Greaves Malcolm Greaves

This pair of ascos 2.5cm across were on recently b

03-12-2025 20:02

Godronia sp.
Buckwheat Pete

Hello everyone, does anyone know the genus Godroni

02-12-2025 19:25

Lasiosphaeriaceae
Buckwheat Pete

Hello, can anyone identify this hairy fungus growi

02-12-2025 14:28

Urceolella crispula?
Mirek Gryc

527 / 5 000Hello everyoneThey grew on dead shoots

30-11-2025 12:53

Calycina cf. languida
Edvin Johannesen Edvin Johannesen

White short-stipitate apothecia found on thin twig

30-11-2025 10:47

Peziza fimeti or granulosa
William Slosse William Slosse

I recently found a collection of small Peziza sp.

27-11-2025 12:01

Valsa/Cytospora on Cryptomeria bark - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10496727

27-11-2025 11:46

another loculo on Aesculus with muriform spores - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10493918

17-09-2025 10:50

Ascomycete on Polystichum proliferum
Heather Merrylees

Hi there!I am hoping for any advice on the identif

29-11-2025 08:40

Small hyalin discomycete on Fagus
Andreas Millinger Andreas Millinger

Hello,on a splintered part of a branch on the grou

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Microthyrium on Alnus?
Marc Detollenaere, 19-04-2023 07:31
Marc DetollenaereDear Forum,
On a small branch of Alnus glutinosa I found some small black pyrenomycetes(0.2mm) with hyaline 1-septate spores of 19.5x4.5µ.Each part of the spore contained 2 large guttules. The asci were remarkebly sacculate.Any ideas?

Marc
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Chris Yeates, 19-04-2023 15:21
Chris Yeates
Re : 1-septate pyreno on Alnus
Hi

Tricky one. The asci and spores (though not the perithecium, from what I can see) remind me a little of Microthyriales. Were the perithecia/pseudothcia flattened? Might the spores have very thin appendages? (oil immersion + cotton blue).

Cordialement, Chris
Marc Detollenaere, 19-04-2023 18:49
Marc Detollenaere
Re : Microthyrium on Alnus?
Hi Chris,

It looks indeed as a Microthyreaceae. Following the genus key, I arrived at Microthyrium but in Microthyrium I have no match.No appendages or cilia were seen in cottonblue.
Another genus?
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Alain GARDIENNET, 20-04-2023 21:55
Alain GARDIENNET
Re : Microthyrium on Alnus?
Bonsoir Marc,
Je serais plutôt du même avis que Chris. Qu'est-ce qui te fait penser à un Microthyrioaceae ? la forme des ascomes en forme de thyriothèces ?
La structure de la paroi ne colle pas, la micro non plus. J'opterais davantage pour un Mycosphaerella. Mais je peusx me tromper.
Alain
Marc Detollenaere, 21-04-2023 10:18
Marc Detollenaere
Re : Microthyrium on Alnus?
Thanks Alain for your remarks. I will look further
Marc