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09-02-2026 22:01

ruiz Jose

Hola, me paso esta colección en madera de pino, t

10-02-2026 17:42

Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Pourriez-vous me donner

10-02-2026 18:54

Erik Van Dijk

Does anyone has an idea what fungus species this m

09-02-2026 20:10

Lothar Krieglsteiner Lothar Krieglsteiner

The first 6 tables show surely one species with 2

09-02-2026 14:46

Anna Klos

Goedemiddag, Op donderdag 5 februari vonden we ti

09-02-2026 11:42

Åge Oterhals

Hi forum, I found this Lachnum on old hardwood tw

02-02-2026 21:46

Margot en Geert Vullings

On a barkless poplar branch, we found hairy discs

25-01-2026 23:23

Tomaz Vucko Tomaz Vucko

Hello! I found this species that resembles Delitsc

06-02-2026 01:14

Tomaz Vucko Tomaz Vucko

Hello!How would you name this species? Most perith

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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!