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17-10-2025 18:45

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, Oct. 2025.

23-09-2025 13:31

Thomas Læssøe

https://svampe.databasen.org/observations/10534623

15-10-2025 16:39

Edvin Johannesen Edvin Johannesen

These tiny (0.2-0.6 mm), white, pulvinate apotheci

03-10-2025 13:44

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde on Populus

13-10-2025 19:05

Louis DENY

Bonjour forumSur tronc décortiqué de feuillu x,

17-02-2013 21:11

Peter Welt Peter Welt

Jamoni, P.G. 1998. Un nuovo discomicete coprofilo

11-10-2025 20:27

Marcel Heyligen Marcel Heyligen

Found on a barked branch, 14 mm in diameter, of Ro

11-10-2025 14:20

Jean-Luc Ranger

bonjour à tous, Je ne vois pas comment l'on peut

09-10-2025 22:14

S. Rebecca

We just had the Bavarian Mycology Conference in Au

10-10-2025 00:49

Ethan Crenson

Hello all, This was found last weekend on a hardw

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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!