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brigitte vignotbonjour trouvée en Ariège sur bois une petite
s/Q. robur: - in fact Monochaetia kansensis.
Luc Bailly,
14-11-2011 16:40
Bonjour 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.
Hans-Otto Baral,
14-11-2011 16:47
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
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
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:
That looks like it. Now to find what can grow on Quercus leaves.
Grove has a suggestion, and the size of spores match:
Hans-Otto Baral,
14-11-2011 17:39
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
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
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.
Cheers - LUC.
Martin Bemmann,
14-11-2011 19:47
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
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
Luc Bailly,
14-11-2011 21:12
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.
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
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
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
Re : s/Q. robur: Seimatosporium? Discosia?
And thanks for the ref!