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28-02-2026 11:05

Peziza
Yanick BOULANGER

Bonjour à tousLe 24/02/2026 à Montmacq, devant m

06-03-2026 17:51

Orbilia?
William Slosse William Slosse

Good evening all,On March 4, 2026, I found the fol

05-03-2026 10:07

White apothecia on pine cone
Hulda Caroline Holte

Hello, I found and collected this species growing

06-03-2026 09:41

indian literature
Alain GARDIENNET Alain GARDIENNET

Hi forum, I'm now looking for another reference c

05-03-2026 19:29

Ciboria caucus?
William Slosse William Slosse

Good evening everyone,On March 4, 2026, I found th

05-03-2026 16:30

Is this Diaporthe rudis?
François Bartholomeeusen

Dear forum members, On the 2nd of February 2026,

19-02-2026 17:49

Ayuda con Tarzetta sp
Salvador Emilio Jose

Hola buenas tardes!! Necesito ayuda para la ident

03-03-2026 20:34

Cercophora-Podospora-Arnium 210226 333 on cow dung
Miguel Ãngel Ribes Miguel Ángel Ribes

Good eveningThese small, amphora-shaped perithecia

28-02-2026 11:54

Sinensia
Alain GARDIENNET Alain GARDIENNET

Hi forum,Is anyone aware if the 1936 edition of Si

02-03-2026 22:07

Geopyxis majalis ?
Jorge Hernanz

Buenas noches!Entre musgos, bajo Pinus halepensis

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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.