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13-02-2026 18:05

Tiny disc on Acer
Margot en Geert Vullings

On February 9, 2026, we found these small hairy di

14-02-2026 10:58

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Bernard CLESSE Bernard CLESSE

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Tiny disc on Acer
Margot en Geert Vullings, 13-02-2026 18:05
On February 9, 2026, we found these small hairy discs on a dead branch of Acer.

Disc:
0.2-0.4 mm in size, sessile, underside dark, hairs lighter to the top, hymenium dark.


Structure:
Only textura intricata visible.


Hairs:
Hairs completely encrusted.
Encrustation loosens in KOH, no change in KOH + Melzers.


Asci:
Difficult to find due to the many hairs and paraphyses.
Measured in water: (43.2) 43.21 - 43.2 × 6.5 - 6.76 (6.8) µm, Q = 6.4 - 6.68 (6.7)
Croziers + we think.
IKI neg, also after KOH + Melzers J neg.


Paraphyses:
Cylindrical with sept.


Spores:
Hyaline with 2 guttules mostly at the poles, sometimes a few smaller guttules.
Measured in water: (6.8) 7.1 - 7.8 (8.2) × (2.2) 2.3 - 2.67 (2.7) µm, Q = (2.6) 2.8 - 3.2 (3.4)


Is it possible to say what genus and perhaps what species this could be?
Many thanks in advance, Geert&Margot


 

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Hans-Otto Baral, 13-02-2026 21:20
Hans-Otto Baral
Re : Tiny disc on Acer
One more collection of a complex of species related to "Hyphodiscus" stereicola. It is my folder "Parahyphodiscus" in Cordieritidaceae. Species delimitation is highly difficult and it is not clear if the names Trichopeziza viridula or Chlorosplenium viridulum are applicable for one of them.
Margot en Geert Vullings, 14-02-2026 11:02
Re : Tiny disc on Acer
Thanks Hans-Otto, it does indeed look very similar to the photos in your folder. 

It's nice to have some idea of what it is.

We assume you are referring to our previous topic, dark disc on Populus 2-2-2026?

Quite a coincidence to find these discs twice in such a short time in different locations.
Kind regards, Geert&Margot
Hans-Otto Baral, 14-02-2026 11:24
Hans-Otto Baral
Re : Tiny disc on Acer
I am not aware, on ascofrance?
Margot en Geert Vullings, 14-02-2026 11:29
Re : Tiny disc on Acer

We dachten dit omdat uw antwoord begint met "Nog een verzameling".

Kind regards, Geert&Margot


Hans-Otto Baral, 14-02-2026 11:35
Hans-Otto Baral
Re : Tiny disc on Acer
Not sure. But if the asci are J+ then it is something else.
Margot en Geert Vullings, 14-02-2026 11:37
Re : Tiny disc on Acer
Sorry, we overlooked that.
Hans-Otto Baral, 14-02-2026 11:43
Hans-Otto Baral
Re : Tiny disc on Acer
You have no photo of the ascus in IKI and of the spores?