Accès membres

Mot de passe perdu? S'inscrire

19-11-2025 23:21

small white discs on Campylopus introflexus
carl van den broeck carl van den broeck

Dear guestIn Waardamme, Belgium, I found dozens of

19-11-2025 20:51

Pyreno on Fagus
Andreas Millinger Andreas Millinger

Good evening,found this species on a felled trunk

19-11-2025 13:04

Karstenia ? spores acuminées
Bruno Coué Bruno Coué

Bonjour,je  sollicite votre avis pour la récote

17-11-2025 21:46

Lachnum impudicum
Philippe PELLICIER

Bonjour,Récolté sur bois pourrissant de feuillu

18-11-2025 18:26

Literature search
David Malloch David Malloch

I am trying to locate the article, Müller, E. 195

16-11-2025 21:09

Hyphomycete on twig of abies
Robin Isaksson Robin Isaksson

Anyone recognize this acc. to pictures.? Found on

18-11-2025 13:59

ID Help Hymenoscyphus
Nogueira Héctor

November 14, 2025 Brazuelo (León) SPAIN Hymenosc

17-11-2025 19:14

Cheilymenia crucipila
herman lambert

Apothécie discoïde 0.6 cm diam., orangeFace hymÃ

17-11-2025 21:57

Hyaloscypha fuckelii var. alniseta
Philippe PELLICIER

Bonjour,Récolté sur bois de feuillu mort dur, no

14-11-2025 16:26

Small species on Cytisus scoparius
Marian Jagers Marian Jagers

Hello everyone, On dead wood of Cytisus scoparius

« < 1 2 3 4 5 > »
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
  • message #75891
  • message #75891
  • message #75891
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?
  • message #75894
  • message #75894
  • message #75894
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