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28-02-2026 15:52

Spooren Marco Spooren Marco

Who has an idea ? I have no coupes made for conid

27-02-2026 17:51

Michel Hairaud Michel Hairaud

Bonjour, Quelqu'un peut il me donner un conseil p

28-02-2026 14:43

Alain GARDIENNET Alain GARDIENNET

A new refrence desired :Svanidze, T.V. (1984) Novy

28-02-2026 11:54

Alain GARDIENNET Alain GARDIENNET

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

28-02-2026 11:05

Yanick BOULANGER

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

29-11-2024 21:47

Yanick BOULANGER

BonjourJ'avais un deuxième échantillon moins mat

27-02-2026 16:17

Mathias Hass Mathias Hass

Hi, Found this on Betula, rather fresh fallen twi

27-02-2026 12:56

Åge Oterhals

Found on fallen cones of Pinus sylvestris in midle

27-02-2026 11:21

Yannick Mourgues Yannick Mourgues

Hi to all. Here is a specie that can may be relat

26-02-2026 22:06

Malcolm  Greaves Malcolm Greaves

Can someone explain the features that split Geoscy

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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!