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09-04-2023 09:38

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Joop van der Lee Joop van der Lee

Requesting the following documentation in which Th

08-04-2023 18:44

Verpa conica var. cerebriformis
Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde April 2023,

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literature request
Angel Pintos Angel Pintos

Hello,anybody has the following article?:Cocoicola

07-04-2023 00:14

Perrotia(?) on Populus
Stefan Jakobsson

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Enrique Rubio Enrique Rubio

Velvety olive-brown sporodochia on flowers of Yucc

24-03-2023 22:04

Small green discs on Ammophila
Marc Detollenaere Marc Detollenaere

Dear Forum,On dead leaves of Ammophila arenaria I

03-04-2023 12:39

Tiny asco on Fallopia
Camille Mertens

Hi all.Collected on Fallopia end of january.Spores

01-04-2023 04:22

Pestalotiopsis microspora? growing indoors on an A/C cardboard filter in Miami, Florida, USA.
Wilhelm Guggisberg Wilhelm Guggisberg

This is the first time I encounter a species of th

02-04-2023 09:50

Exarmidium inclusum on hard wood on Sorbus
Robin Isaksson Robin Isaksson

Hi! I dont know where to look to get a namne on th

01-04-2023 19:25

Ascobolus
Ismael Wind

This yellow one on flowersoil most on little Woody

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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