07-03-2026 13:06
éric ROMERO
Bonjour tous, Sur cône d'épicea fortement imbu,
05-03-2026 16:30
François BartholomeeusenDear forum members, On the 2nd of February 2026,
06-03-2026 09:41
Alain GARDIENNET
Hi forum, I'm now looking for another reference c
05-03-2026 10:07
Hulda Caroline HolteHello, I found and collected this species growing
19-02-2026 17:49
Salvador Emilio JoseHola buenas tardes!! Necesito ayuda para la ident
03-03-2026 20:34
Miguel Ángel Ribes
Good eveningThese small, amphora-shaped perithecia
I have found fruit bodies growing on a stem of Epilobium hirsutum, which display characteristics of the genus Plagiostoma. The attached photo shows the densely grouped fruit bodies, with ostioles offset to the edge of the perithecia.
The spores, which are faintly 1-septate, have a very short bristle at each end, as shown in the attached sketch.
I have referred to the Systematic Account of the Genus Plagiostoma, which was published in March 2011 and see that there are no species included on the substrate Epilobium. Using the key instead, my sample does not key out, based on the microscopic and macroscopic characteristics either.
I wonder if during the four years since the systematic account was published, species of Plagiostoma have been found and identified on other hosts.
I do have a lot of fruit bodies, if anyone is interested for sequencing etc.
Thank you,
With Best Wishes,
Peter.
Hi Peter,
See Gnomonia riparia.
Alain
useful description (under Cryptoderis) here:
http://www.librifungorum.org/Image.asp?ItemID=8&ImageFileName=SyllogeFungorum2-230.jpg
regards
Chris
SnapShot-0001.jpgThank you both for the useful references.
Gnomonia riparia does look good. I had not considered the genus Gnomonia, because of the distinctly offset position of the ostiole.
I do notice that both of the descriptions mention 4-spored asci, whereas I noted 8-spored. I will have another look at my sample to see whether there are any 4-spored.
With Best Wishes,
Peter.
Yes Peter, I note 8 ascospores in each ascus too. It looks like 4-spored (see my photo) but is indeed 8-spored.
Monod has worked on the material of Niessl, Graz 1874, as and he has seen a few asci. Perhaps he has not seen enough good material. And perhaps that G. misella on Hypericum is an other fungus. Molecular data would be necessary.
We can call our fungus "Gnomonia riparia" in the meantime.
Alain
Yes, I thought that I could see a fifth spore in your ascus photo.
I did notice in the descriptions that there were very few asci available.
My sample certainly has 8-spored asci, which are presumably dead, because the spores are spread throughout instead of being grouped at the tip.
I will record it as Gnomonia riparia.
With Best Wishes,
Peter.