Accès membres

Mot de passe perdu? S'inscrire

13-12-2025 17:26

Lachnaceae?
Buckwheat Pete

Hello everyone,I have a rather interesting ascomyc

13-12-2025 11:58

Diaporthe oncostoma?
Mirek Gryc

HiSupposedly this is a species that occurs quite o

12-12-2025 18:39

Similar to Pyrenopeziza deuncinata?
Mirek Gryc

Hello everyone.Macrofeatures similar to Mollisia b

09-12-2025 12:06

Hypobryon heterotropum
Andgelo Mombert Andgelo Mombert

Bonjour,Je recherche l'article concernant Hypobryo

07-12-2025 16:07

Ascomycet mit Sammelfruchtkörper.
Arnold Büschlen

Hallo, ich habe in einer Moos-Aufsammlung (epiphy

08-12-2025 21:04

Hymenoscyphus phyllogenus
Mark Stevens

"Hello everyone,I'm relatively new to microscopy (

08-12-2025 18:59

aff. Tricharina?
Lothar Krieglsteiner Lothar Krieglsteiner

.. found by a seminar-participant, I do not know t

08-12-2025 21:18

Nectriaceae
Buckwheat Pete

Hello everyone, Is it possible to at least approx

07-12-2025 17:43

Helvella
Malcolm Greaves Malcolm Greaves

This Helvella was in mixed woodland. Uniform cupul

08-12-2025 17:37

possibly related to Melanomma - on Abies
Lothar Krieglsteiner Lothar Krieglsteiner

20.6.25, on branch of Abies infected and thickened

« < 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