08-12-2025 21:04
Mark Stevens"Hello everyone,I'm relatively new to microscopy (
08-12-2025 18:59
Lothar Krieglsteiner
.. found by a seminar-participant, I do not know t
08-12-2025 17:37
Lothar Krieglsteiner
20.6.25, on branch of Abies infected and thickened
07-12-2025 16:07
Arnold BüschlenHallo, ich habe in einer Moos-Aufsammlung (epiphy
16-03-2014 22:00
Ralph Vandiest
Hello,I found this species a few months ago but ha
08-12-2025 13:39
Thomas Læssøehttps://svampe.databasen.org/observations/10572899
05-12-2025 17:33
Bruno Coué
Bonjour, je serais heureux de recueillir votre avi
06-12-2025 00:19
Viktorie Halasu
Hello, would anyone have this article, please? An
White Hymenoscyphus
Juuso Äikäs,
03-08-2020 20:40
The apos were fairly tough and yellowing.
Asci with croziers, IKI+, paraphyses with VBs. If I interpreted correctly, the medullary excipulum is of textura intricata and ectal excipulum of textura prismatica.
Spores:
(15.7) 16.7 - 18.9 (20.5) × (4) 4.3 - 4.9 (5) µm
Q = (3.2) 3.7 - 4 (5.1) ; N = 20
Me = 17.8 × 4.6 µm ; Qe = 3.9
Might someone know what the species could be?
Hans-Otto Baral,
03-08-2020 20:43
Re : White Hymenoscyphus
Well, this is the most comkmon discomycete since about 20 years: H. fraxineus, cause of the ash dieback disease. Differs from H. fraxineus merely by having croziers.
Both on blackened Fraxinus petioles.
Enrique Rubio,
03-08-2020 20:51
Re : White Hymenoscyphus
Hi Zotto
Do you know if H. fraxineus has been found in Spain? I only see H.albidus.
Enrique
Do you know if H. fraxineus has been found in Spain? I only see H.albidus.
Enrique
Juuso Äikäs,
03-08-2020 20:58
Re : White Hymenoscyphus
Ok then, thank you! H. pseudoalbidus is apparently an older name for it. Fraxinus isn't at all common here and I'm not too familiar with it. I thought it would be more tree-like. Or maybe that's some other plant and the petioles came from a nearby tree?
Hans-Otto Baral,
03-08-2020 21:22
Re : White Hymenoscyphus
I am still unaware of Spanish record. Even in Poitou-Charente I am not sure.
Certainly these are Fraxdinus petioles. The transsect should be bilateral-symmetrical (flattened).
Enrique Rubio,
03-08-2020 21:28
Re : White Hymenoscyphus
It seems that Spanish ash trees are strong and still resist the advance of this fungus.
On the one hand I want to see the fungus, but on the other I don't.
Thanks, Zotto.
On the one hand I want to see the fungus, but on the other I don't.
Thanks, Zotto.
Hans-Otto Baral,
03-08-2020 21:35
Re : White Hymenoscyphus
I can hardly believe that. maybe the climate is not good for the fungus, or the Pyrenees form a barrier. But in Croatia it occurs since many years.
Enrique Rubio,
04-08-2020 00:43
Re : White Hymenoscyphus
It was just a joke.
Hans-Otto Baral,
04-08-2020 06:48
Re : White Hymenoscyphus
It is hard to believe but it seems that there is no rapid spread by birds etc. but only by wind via a few 100 m per year. The height of the Pyrenees should not be a reason because in the Alps it occurs up to the subalpine region.
Martin Bemmann,
04-08-2020 10:24
Re : White Hymenoscyphus
And what is worse: it jumps on Oleaceae other then Fraxinus:
as Phillyrea, native to mediterranian countries...
Regards
Martin
Enrique Rubio,
04-08-2020 11:20
Re : White Hymenoscyphus
That's very interesting.
Thank you, Martin.
Thank you, Martin.