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05-11-2024 10:35

Juuso Äikäs

These pale-yellow fruitbodies were growing on core

03-11-2024 17:36

B Shelbourne B Shelbourne

• Macro and habitat suggest Hymenoscyphus s.l.,

04-11-2024 22:58

B Shelbourne B Shelbourne

• Both Erysiphe and Phyllactinia species reporte

04-11-2024 20:28

Malcolm  Greaves Malcolm Greaves

A small group of Scutellinia found on a rotting lo

04-11-2024 17:32

Yves Antoinette

Bonjour, je pense qu'il peut s'agir de Trichoderma

03-11-2024 07:27

Juuso Äikäs

This tiny (0.2 mm wide) brown cup fungus was growi

02-11-2024 16:34

B Shelbourne B Shelbourne

• Host suggests Sawadaea bicornis or Phyllactini

01-11-2024 14:54

Rot Bojan

Can someone tell me more about this mushroom pleas

31-10-2024 22:25

Karen Poulsen

Hello, On half weathered Betula leaf, I noticed t

31-10-2024 21:42

Karen Poulsen

Hello, On last year's pine needles on the ground

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Helotiales on Betula leaf
Juuso Äikäs, 03-11-2024 07:27
This tiny (0.2 mm wide) brown cup fungus was growing on a decaying Betula leaf.

Asci 8-spored, IKI+(b). The asci have prominent basal protuberances, but seem to lack proper croziers.


There were some cylindrical cells without contents that might be paraphyses or marginal cells.


The excipulum seems to be of textura porrecta.


Spores:


9.6 - 11.89 (11.9) × (2.5) 2.53 - 3.28 (3.3) µm
Q = 3 - 4.1 ; N = 5
Me = 10.2 × 2.8 µm ; Qe = 3.6


 

Hans-Otto Baral, 03-11-2024 07:50
Hans-Otto Baral
Re : Helotiales on Betula leaf
I imagined Hyaloscypha fuscostipitata but that has definitely smaller spores and particularly strongly tapering hairs, also a dark base. And you are right: the ascus protuberance does not fuse. What seems to be paraphyses is not clearly alive, are you sure that the fungus has no VBs?
Juuso Äikäs, 03-11-2024 08:38
Re : Helotiales on Betula leaf
Thanks, I'm not entirely sure about VBs -- maybe the fruitbody wasn't in the best condition. Wish I had some extra material. There was some brown pigment on the outside, maybe from crushed cells?
  • message #80578
Hans-Otto Baral, 03-11-2024 08:56
Hans-Otto Baral
Re : Helotiales on Betula leaf
There are globose bodies with that colour which could point to multiguttulate VBs, but not sure.