Accès membres

Mot de passe perdu? S'inscrire

21-03-2026 15:13

Lepista Zacarias

Hello everyone, Does any one know of any literatu

21-03-2026 22:59

Petr Soucek

Good evening, I would appreciate some advice on th

20-03-2026 12:53

Stefan Blaser

Hello everybody, In the field, from distance, my

20-10-2017 09:23

Garcia Susana

Este otro crecía en el mismo trocito de madera qu

20-03-2026 16:16

Edvin Johannesen Edvin Johannesen

These 0.5 mm diam. acervuli were breaking through

19-03-2026 19:34

Filip Fuljer Filip Fuljer

Hello everyone,a few days ago I collected this str

19-03-2026 18:25

William Slosse William Slosse

Good evening everyone, On 18/03/26 I found a few

17-03-2026 10:09

François Freléchoux François Freléchoux

Bonjour, Voici la description rapide d'un petit d

19-03-2026 15:58

Stefan Blaser

Hello everybody, I hope for some hints... Macro:

19-03-2026 17:50

Enrique Rubio Enrique Rubio

Hi to everybodyThese thiny, blackish pseudothecia

« < 1 2 3 4 5 > »
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!