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24-08-2020 13:00

Yulia Lytvynenko Yulia Lytvynenko

Dear friends.Looking for a copy of the following w

11-07-2024 14:29

Viktorie Halasu Viktorie Halasu

Hello, a thin-fleshed Mollisia on a monocot stem

15-07-2024 10:38

Joaquin Martin

Hi, I found this Ascobolus in company of Cheilyme

14-07-2024 18:23

Joaquin Martin

Hi,I found this Ascomycete on horse dung.The spora

13-07-2024 19:50

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello,I have identified this fungus as Hamatocanth

11-01-2022 16:36

Jason Karakehian Jason Karakehian

Hi does anyone have a digital copy of Raitviir A (

08-07-2024 23:34

Villalonga Paco

Small Scutellinia growing in garden soil (calcareo

12-07-2024 02:12

Stefan Jakobsson

On a wet lake shore I found a single minute apothe

11-07-2024 10:57

Viktorie Halasu Viktorie Halasu

Hello, I have here a Mollisia on a leaf (possibly

07-07-2024 10:07

Thomas Flammer

I am struggeling with some tiny yellowish apotheci

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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.