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11-05-2025 17:57

Louis DENY

Hello forumTrouvé dans les environs de Belfort,al

10-05-2025 18:47

David Chapados David Chapados

Hi, Does anyone have an idea of what this could b

08-05-2025 20:50

Andreas Jacob

Good evening, due to contstant drought I started

11-05-2025 10:22

Karl Soler Kinnerbäck

Found on moist Betula wood dipped in freshwater st

11-05-2025 10:35

ruiz Jose

Hola, en excremento de jabali, tamaño de unos 2 m

05-05-2025 10:09

Nicolas Suberbielle Nicolas Suberbielle

Re-bonjour,Cet ascomycète trouvé et étudié par

09-05-2025 16:01

Thomas Flammer

I found a black cushon which might eventually be 

09-05-2025 19:10

Enrique Rubio Enrique Rubio

Hi to everybody.This Orbilia (apos up to 0.5 mm),

02-05-2025 13:29

Isabelle Charissou

Bonjour, j'aimerais savoir s'il y a eu des public

06-05-2025 13:37

Thomas Flammer

Munk, Anders (1953). The System of the Pyrenomycet

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Hymenoscyphus ->H. vacini
Margot en Geert Vullings, 19-09-2023 10:46
We found these ascomycetes in a damp ditch, most likely on oak leaf veins.
With Ellis&Ellis and Fungi of Temperate Europe we ended up at Hymenoscyphus, because of the large spores.
Fruit bodies: 0.5-2mm diameter, dark yellow
Spores size: 22-23.4 x 5.6-6.06 µ (measured in water)
Ascus size: 92.7-113.5 x 9.64-11.8 µ (measured in water)
Paraphyses: VB's
Ascus: we haven't found any croziers, but we still find that very difficult.
We can't figure it out with this key: https://web.micolosa.net/wp-content/uploads/claves-hymenoscyphus.pdf
Which Hymenoscyphus could this be?

Thank you in advance,

Margot
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Hans-Otto Baral, 19-09-2023 15:17
Hans-Otto Baral
Re : Hymenoscyphus
This must be H. vacini on Acer. I never had it on another tree. Typical the skeletonized leaf and the fine dark network on the receptacle and dark stipe. The reticulum is not celar on your pics, though. And I do not know the species dark yellow or yellow-orange as I see on my screen.

I have published on this species in my paper about H. fraxineus/albidus.

The absence of croziers I cann see:
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Margot en Geert Vullings, 19-09-2023 19:41
Re : Hymenoscyphus
Thank you very much Zotto, that could possibly be a new species for the Netherlands.
Acer leaf is very possible, there are also Acer trees.

I added pictures of the reticulum, is that what you mean?

Margot
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Hans-Otto Baral, 19-09-2023 20:42
Hans-Otto Baral
Re : Hymenoscyphus
It could be, I think it is not always distinct under the micro but could be seen in macrophotos of the underside. But I really think it is not constant. More clear is the blackish stipe, like the H. albidus group.

I compared leaves of Acer pseudoplatanus with H. vacini in my folder, and actually the branching of the main veins of the leaf is alternate, contrary to the branching of the twigs of Acer.
Margot en Geert Vullings, 19-09-2023 21:38
Re : Hymenoscyphus
I have added a photo of the underside and a not so sharp photo of the leaf veins.

That part of the forest contains from Acer mainly Acer Pseudoplatanus, there was an inventory there last year.

Margot
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Hans-Otto Baral, 20-09-2023 09:20
Hans-Otto Baral
Re : Hymenoscyphus
At least the black stipe base and the dark marginal rim are typical.
Margot en Geert Vullings, 20-09-2023 10:21
Re : Hymenoscyphus
Thank you very much Zotto.

We saw that there is already one sighting in the Netherlands with the name Lanzia vacini.

Margot


Hans-Otto Baral, 20-09-2023 10:36
Hans-Otto Baral
Re : Hymenoscyphus
Yes, that was the old school who considered all blackening of the substrate as indication for a relationship with Sclerotiniaceae. H. albidus was therefore transferred by Korf to Lambertella.