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08-04-2026 20:33

Vasileios Kaounas Vasileios Kaounas

Found 07-04-26, in Abies cephalonica. Diameter 1,

08-04-2026 10:39

FRANCIS FOUCHIER

Bonjour , je recherche en pdf cet article: KORF R

06-04-2026 15:04

David Chapados David Chapados

Hi! Could someone help me identifying this specim

29-06-2016 15:18

Per Vetlesen

HiIt was found on the bark of a dead branch of Jun

07-01-2018 22:47

Per Vetlesen

Grown in moist chamber on bark/resin of fallen Pin

06-04-2026 21:36

Viktorie Halasu Viktorie Halasu

Hello, could anyone please send me the article wi

06-04-2026 19:40

David Gibbs David Gibbs

Help with this one much appreciated, on rotting Fa

06-04-2026 11:07

Louis DENY

Bonjour forum, Trouvé sur bois de feuillu très d

06-04-2026 16:24

Juuso Äikäs

Last Tuesday I found some tiny white Helotiales gr

05-04-2026 13:33

Sylvie Le Goff

Bonjour à tousPuis avoir votre avis sur ce champi

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Phaeohelotium on deciduous wood?
Oskari Virtanen, 29-12-2025 09:38
Hi,
could anyone help me identify this, I suspect Phaeohelotium or maybe Hymenoscyphus? I was thinking something along the lines of Leptodontidium (/P.) trabinellum or P. fulvidulum but I couldn't get the asci or spore size to fit.

- On rotten, decorticated deciduous wood (Betula or Populus), damp mixed forest, Southwest Finland (Turku), December 2025.
- Diameter approx. 1.5 mm, growing gregariously in a 20 cm area, almost sessile.
- Asci 8-spored, IKI+, with croziers, (105.4) 115 - 124.8 (127.4) × (6.6) 6.8 - 7.7 (8.8) µm.
- Living spores in water (10.3) 10.6 - 13.8 (14.2) × (3.5) 3.8 - 4.6 (4.9) µm, Q = (2.3) 2.6 - 3.3 (3.4); N = 25, occasionally 1-septate.
- Paraphyses rarely exceeding asci, with some droplets, apices never swollen, 1.5 - 2.8 µm at the apex.


I'm quite new to asco microscopy so please let me know if you need anything else. :)


Best,
Oskari

  • message #84190
  • message #84190
  • message #84190
  • message #84190
  • message #84190
Hans-Otto Baral, 29-12-2025 09:46
Hans-Otto Baral
Re : Phaeohelotium on deciduous wood?
Ascus and spore size is not the only critical detail, but look at the apical ring of the Calycina type. Can you exclude Calycina citrina?
Nicolas VAN VOOREN, 29-12-2025 09:46
Nicolas VAN VOOREN
Re : Phaeohelotium on deciduous wood?
In my opinion, the amyloid reaction of asci is of Calycina-type, so this excludes Phaeohelotium or Hymenoscyphus...
Oskari Virtanen, 29-12-2025 09:58
Re : Phaeohelotium on deciduous wood?
The microscopy does indeed fit C. citrina, and looking at the descriptions I see no good reason to exclude it. I'm used to seeing it a much brighter yellow, so I mindlessly went past it. Also good to know that this type of reaction is common to Calycina. Thank you both!