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04-12-2023 08:32

Patrice TANCHAUD

Bonjour, récolte réalisée au sol dans un parc,

01-12-2023 21:54

Marian Jagers Marian Jagers

Does anyone recognize this species? Apothecia in

04-12-2023 10:01

François Bartholomeeusen

Dear forum participants, On a thin twig of Myrica

03-12-2023 19:21

ruiz Jose antonio

Hola a todos, en un talud cercano a un riachuelo,

28-11-2023 23:10

Villalonga Paco

On basic soil in humid bank, Teruel, Spain, around

02-12-2023 21:21

Elisabeth Stöckli

Bonsoir, Récolte en milieu incendié, apothécie

25-11-2023 14:49

Kees van Oorde Kees van Oorde

Very small fruiting bodies on affected leaves. Fou

30-11-2023 14:33

Béatrice Senn-Irlet

alll issues of Mycologia Helvetica (1983-2000) are

28-01-2014 10:50

Gernot Friebes

Hi,I'm looking for these three standard references

25-11-2023 18:14

Danny Newman Danny Newman

higher resolution images available at inaturalist.

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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.