04-11-2025 09:07
Josep Torres
Hello.A suspected Hymenoscyphus sprouting on a thi
04-11-2025 12:43
Edvin Johannesen
Hi! One more found on old Populus tremula log in O
03-11-2025 21:34
Edvin Johannesen
These tiny (0.4-0.5 mm diam.), whitish, short-stip
28-10-2025 15:37
Carl FarmerI'd be grateful for any suggestions for this strik
03-11-2025 16:30
Hans-Otto Baral
Hello I want to ask you if you have found this ye
Leptosphaeria on Cirsium
Gernot Friebes,
19-07-2010 15:39
Leptosphaeria is a really complicated genus so I am not really sure about the two collections I collected two days ago. I would be happy if you could help me. :)
The first one here grew on a dry stem of Cirsium. Very conspicuous are the collapsing ascomata when they are older. The spores are (33)38-42 x 4.5-5 µm and 6-celled with the third cell swollen. The peridium consists of big and dark cells and the ostiolum is filled with hyaline to slightly brownish cells and not with periphyses.
With the paper by Müller (1950) I come to L. ogilviensis and I think that, according to some other descriptions, this species could be close to mine.
Best wishes,
Gernot
ascomata
Gernot Friebes,
19-07-2010 15:42
Re:Leptosphaeria on Cirsium
spores (scale=10 µm):
Gernot Friebes,
19-07-2010 15:43
Re:Leptosphaeria on Cirsium
asci (scale=10 µm):
Gernot Friebes,
19-07-2010 15:43
Re:Leptosphaeria on Cirsium
sections (botton left corner: ostiole/scale=10 µm):
Alain GARDIENNET,
19-07-2010 15:45
Re:Leptosphaeria on Cirsium
Hi Gernot,
Have you photo of ascospores to see color and the sequence of septation ?
But I think L. ogilviensis is a good idea !
My answer came too quickly, photos were absent, and with the photos, I agree with ogilviensis.
Alain
PS : but are you sure of Cirsium. Could it be Valeriana or other else ?
Have you photo of ascospores to see color and the sequence of septation ?
But I think L. ogilviensis is a good idea !
My answer came too quickly, photos were absent, and with the photos, I agree with ogilviensis.
Alain
PS : but are you sure of Cirsium. Could it be Valeriana or other else ?
Gernot Friebes,
19-07-2010 16:07
Re:Leptosphaeria on Cirsium
Hi Alain,
thanks for these quick answers!
Here I am not 100% sure about the substrate because there were so many other plants (but mainly Cirisum) around, maybe I am wrong with Cirsium. At least it had little spines which hurt me while trying to take photos of it...
I will compare my other find with fuckelii, thank you again!
Best wishes,
Gernot
thanks for these quick answers!
Here I am not 100% sure about the substrate because there were so many other plants (but mainly Cirisum) around, maybe I am wrong with Cirsium. At least it had little spines which hurt me while trying to take photos of it...
I will compare my other find with fuckelii, thank you again!
Best wishes,
Gernot