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26-04-2025 16:01

Jacques Fournier Jacques Fournier

J'ai le regret d'informer les membres du forum qui

26-04-2025 07:15

Dragiša Savic

Hello everyone,the lichen is Candelariella aurella

25-04-2025 22:48

Gustaf Fredell Gustaf Fredell

Hello,I hope everything is going well. I couple mo

18-04-2025 23:16

Robin Pétermann Robin Pétermann

Bonjour, Voici une probable Mollisia, genre que j

24-04-2025 21:35

Thorben Hülsewig

Hi there,last week i could found this asco on an S

25-04-2025 17:24

Stefan Blaser

Hi everybody, This collection was collected by J

25-04-2025 09:33

Josep Torres Josep Torres

Ascomata shaped like deformed black grains, measur

24-04-2025 21:53

Lothar Krieglsteiner Lothar Krieglsteiner

... 15.7.24 in the Alps. There were many asci with

23-04-2025 20:16

Miguel Ãngel Ribes Miguel Ángel Ribes

Good afternoon Looking for Octospores / Lamprospo

24-04-2025 15:03

Henri Koskinen

Hello, I collected this Lasiobolus 22.04. near Hel

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s/Q. robur: - in fact Monochaetia kansensis.
Luc Bailly, 14-11-2011 16:40
Luc BaillyBonjour à tous,

A la fin de la saison, le temps est venu de poster quelques descriptions de récoltes pour lesquelles je n'ai aucune idée.

D'abord, des acervules formant des pustules noires à l'aspect granuleux sur la face supérieure des feuilles de Quercus robur, et faisant craquer l'épiderme. Taille: ~0.2 mm
Les conidies sont particulières: 3-septées, prolongées à chaque extrémité par un filet, qui semble dans le prolongement exact de chaque cellule de l'extrémité. Elles sont de couleur brun olive, avec les 3 cellules centrales plus sombres. Taille: (20)21-25 x (5)5.5-6.5 µ.

Une idée?
Amitiés - LUC.
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Hans-Otto Baral, 14-11-2011 16:47
Hans-Otto Baral
Re : s/Q. robur: Seimatosporium? Discosia?
Hi Luc

seems to be a Pestalotia. I have no collections or photos, but go to your Browser and search for images with that name.

Zotto
Luc Bailly, 14-11-2011 17:09
Luc Bailly
Re : s/Q. robur: Seimatosporium? Discosia?
Hi Zotto and thanks,
That looks like it. Now to find what can grow on Quercus leaves.
Grove has a suggestion, and the size of spores match:
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Hans-Otto Baral, 14-11-2011 17:39
Hans-Otto Baral
Re : s/Q. robur: Seimatosporium? Discosia?
Hi Luc

the fungus is  not in Ellid & Ellis (on Quercus), and I have no idea. But the one by Saccardo has 4 setae, and all at one end.

Zotto
Luc Bailly, 14-11-2011 19:05
Luc Bailly
Re : s/Q. robur: Seimatosporium? Discosia?
Yes. That's why I remain careful, and I prefer to note it as cf. Pestalotia, while waiting for better.
Cheers - LUC.
Martin Bemmann, 14-11-2011 19:47
Martin Bemmann
Re : s/Q. robur: Seimatosporium? Discosia?
Hi Luc and Zotto,

why not a Mono[sic!]chaetia? There are some recorded on Quercus leaves, as saccardiana or kanensis. I add Nag Raj's drawing of the latter but I don't know how to key out the species. (Key attached)

Cheers

Martin
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Luc Bailly, 14-11-2011 21:12
Luc Bailly
Re : s/Q. robur: Seimatosporium? Discosia?
Hi Martin,
When I follow the key and I compare with photos and data's of my sample, I get:
- Conidia's smooth
- Conidia's 4-septate (not 3)
- Long basal appendage
- Color rather brownish than olive, no green tint; as for the width, two options can fit, as mean width is around 6µ. But it can indeed lead to Monochaetia kansensis.

Thanks, Martin, I think you got it!

What's the complete ref of this book?

Cheers - LUC.
Martin Bemmann, 14-11-2011 21:27
Martin Bemmann
Re : s/Q. robur: Seimatosporium? Discosia?
Hi Luc,

I am happy this was of help.

The complete title is: Nag Raj, T.R. (1993) Coelomycetous anamorphs with appendage bearing conidia. Waterloo (not in Belgium but in Ontario, Canada... ;-) )

Best regards

Martin
Luc Bailly, 14-11-2011 21:28
Luc Bailly
Re : s/Q. robur: Seimatosporium? Discosia?
And thanks for the ref!