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06-11-2022 17:22

"pézize" dans littérature ancienne
Jérôme MAFFERT

Bonjour, j'ai trouvé cette description datant de

06-11-2022 13:25

Brown clusters on Sorbus branch
Juuso Äikäs

Clusters of these brown ascomata were growing on a

01-11-2022 19:30

Pilobolus on dung
Juuso Äikäs

This Pilobolus species was growing on dung of some

03-11-2022 13:11

Ciboria coryli ?????
Castillo Joseba Castillo Joseba

Del pasado sabado en bosque de Avellanos  (Corylu

02-11-2022 15:30

on living raspberry leaf
Yannick Mourgues Yannick Mourgues

Hi. Found black deposits on lower surface of livi

03-11-2022 01:58

Cosmospora on Ustulina?
Steffen Lorenz

Hello, looking for Cosmospora ustulinae on Ustuli

01-11-2022 21:51

literature request and apology!
Simon Kennedy

I posted the request three times, how, I do not kn

01-11-2022 15:17

Hymenoscyphus sp
ruiz Jose

Hola a todos. En una rama sumergida en riachuelo e

01-11-2022 17:23

Need help for this Anthracobia
Pierre-Yves Julien

Récolte le 25/10/2022 – France, Haute-Vienne (8

01-11-2022 01:17

literature request
Angel Pintos Angel Pintos

Hello,anybody can get this article?Samsoniella alb

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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