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25-04-2026 11:34

lachnum pudicellum
Louis DENY

Bonjour forumdans la clé de Zotto, L. pudicellum

22-04-2026 20:54

Pyrenopeziza on monocot.
Enrique Rubio Enrique Rubio

Hi to everybody.This Pyrenopeziza grew in moist le

24-04-2026 03:16

Trinacrium robustum?
David Chapados David Chapados

Found while looking at something else from wood in

22-04-2026 01:06

Neonectria ou thelonectria ?
Richard VALERI Richard VALERI

Bonjour à tous.Je vous présente cette Nectria s.

22-04-2026 20:17

Pseudaegerita spec.
Marian Jagers Marian Jagers

Is anyone familiar with the Hyphomycetes genus Pse

23-04-2026 06:46

Fungus sp
François Freléchoux François Freléchoux

Bonjour, Voici la description d'un minuscule asco

21-04-2026 22:14

Peziza
Margot en Geert Vullings

This cup fungus was found on April 10, 2026, on lo

22-04-2026 19:12

Poilu, violet avec KOH
Louis DENY

Bonjour forum.Trouvé à Belfort, est de la France

21-04-2026 21:00

Hymenoscyphus sp
Sylvie Le Goff

Bonjour à tousJe sollicite votre aide pour cet as

21-04-2026 13:36

Wentiomyces-like on Salix
Gernot Friebes

Hi,I am out of ideas for this one. I collected Sal

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Asco on Himalayan Balsam
Malcolm Greaves, 04-06-2020 18:28
Malcolm GreavesHello
Can someone help with this long necked flask found on a dead Himalayan Balsam stem.
Only 1/3mm with spores 5.3 x 2.5. The spores look to be developing a septa but I could find none with a fully developed one so migh just be the internal structure.
Thanks
Mal
  • message #63549
  • message #63549
  • message #63549
Guy Buddy, 04-06-2020 23:25
Re : Asco on Himalayan Balsam
Hey Mal
I will take a guess and say something in the ophiostomatales but with only the anamorph it’s hard to narrow it down.
Devin
Malcolm Greaves, 05-06-2020 08:42
Malcolm Greaves
Re : Asco on Himalayan Balsam
Ok thanks for that Devin.
Mal
Paul Cannon, 05-06-2020 18:12
Re : Asco on Himalayan Balsam
Hello Mal

It's possible that this could be Arxiomyces vitis (syn. Phaeostoma vitis), which has evanescent asci with ascospores about the size that you give. They have a single large germ pore (large in comparison to the spore width) at one end of the ascospore - I wasn't sure whether I could see that in your image. It would only be the second GBI collection, to my knowledge, and if you have more material I'd be interested to see it.

There's not much published info on the genus but I'll send you a paper that treats the species (as Phaeostoma).

Best wihes

Paul
Malcolm Greaves, 06-06-2020 22:23
Malcolm Greaves
Re : Asco on Himalayan Balsam
Thanks I will get it in the post.
Paul Cannon, 14-06-2020 17:02
Re : Asco on Himalayan Balsam
I've looked at the specimen that Mal kindly sent me. I think it is a species of Arxiomyces, but it is a little different from A. vitis and is probably undescribed.