17-10-2025 18:45
Riet van Oosten
Hello, Found by Laurens van der Linde, Oct. 2025.
23-09-2025 13:31
Thomas Læssøehttps://svampe.databasen.org/observations/10534623
15-10-2025 16:39
Edvin Johannesen
These tiny (0.2-0.6 mm), white, pulvinate apotheci
03-10-2025 13:44
Riet van Oosten
Hello, Found by Laurens van der Linde on Populus
13-10-2025 19:05
Louis DENYBonjour forumSur tronc décortiqué de feuillu x,
11-10-2025 20:27
Marcel Heyligen
Found on a barked branch, 14 mm in diameter, of Ro
09-10-2025 22:14
S. RebeccaWe just had the Bavarian Mycology Conference in Au
10-10-2025 00:49
Ethan CrensonHello all, This was found last weekend on a hardw
Hymenoscyphus ->H. vacini
Margot en Geert Vullings,
19-09-2023 10:46
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
Hans-Otto Baral,
19-09-2023 15:17
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:
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.
Acer leaf is very possible, there are also Acer trees.
I added pictures of the reticulum, is that what you mean?
Margot
Hans-Otto Baral,
19-09-2023 20:42
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
Hans-Otto Baral,
20-09-2023 09:20
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
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.