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11-02-2026 22:15

Rutstroemia maritima?
William Slosse William Slosse

Today, February 11, 2026, we found the following R

11-02-2026 19:28

Peziza spec. from Germany
Lothar Krieglsteiner Lothar Krieglsteiner

on small deciduous twig on the ground in forest wi

25-04-2025 17:24

Cosmospora/Dialonectria spec.
Stefan Blaser

Hi everybody, This collection was collected by JÃ

09-02-2026 22:01

Sp
ruiz Jose

Hola, me paso esta colección en madera de pino, t

10-02-2026 17:42

Hélotiale blanche sur Sambucus racemosa
Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Pourriez-vous me donner

10-02-2026 18:54

Unknown pink heliotale on sphagnum
Erik Van Dijk

Does anyone has an idea what fungus species this m

09-02-2026 20:10

(2 different or one ?) Hypoxylon from the Algarve – on Acacia and Arbutus
Lothar Krieglsteiner Lothar Krieglsteiner

The first 6 tables show surely one species with 2

09-02-2026 14:46

Cistella granulosella of Hyphodiscus incrustatus?
Anna Klos

Goedemiddag, Op donderdag 5 februari vonden we ti

09-02-2026 11:42

Lachnum sp.
Ã…ge Oterhals

Hi forum, I found this Lachnum on old hardwood tw

02-02-2026 21:46

Dark disc on Populus
Margot en Geert Vullings

On a barkless poplar branch, we found hairy discs

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edit: Hymenoscyphus caudatus H+ in North America
Khomenko Igor, 04-08-2021 18:35
Khomenko IgorHi,

Is this Hymenoscyphus fraxineus, or do we have something else in Eastern North America? I find mostly H. albidus on rotten leaves here around Ottawa, On, Canada.

This was on heavily rotten leaves on the wet ground. Apothecia small, under 2mm in diameter white and later pale yellowish, stipitate.
Asci 8-spored, IKI+bb, croziers(+), 97x11um, 107x10um, 106x11um.
Ascospores scutuloid, OCI=4,
(16) 16.3 - 20.5 (21.2) × (4.3) 4.4 - 4.8 (4.9) µm
Q = (3.4) 3.5 - 4.5 (4.7) ; N = 23
Me = 18.1 × 4.6 µm ; Qe = 3.9
Paraphyses are cylindrical with multiguttulate VBs, 3.3-3.8um width.

Thank you for your help,
Igor

P.S. more data here: https://inaturalist.org/observations/89861349
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Martin Bemmann, 04-08-2021 18:48
Martin Bemmann
Re : Hymenoscyphus fraxineus? in North America
Hi Igor,

with croziers + it can be only H. fraxineus in Europe. Do you find them on leaves or their rachises? And on Fraxinus?

Best Martin
Khomenko Igor, 04-08-2021 19:12
Khomenko Igor
Re : Hymenoscyphus fraxineus? in North America
I think it is on leaves and I'm not sure about the host. It doesn't look like Fraxinus to me, but Fraxinus is abundant as new growth in that area. We lost almost all mature trees because of the emerald ash borer.
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Martin Bemmann, 04-08-2021 20:04
Martin Bemmann
Re : Hymenoscyphus fraxineus? in North America
This doesn't look like leaves of Fraxinus.  Fraxinus has pinnate leaves.
Juuso Äikäs, 04-08-2021 20:22
Re : Hymenoscyphus fraxineus? in North America
Would H. caudatus s.l. be possible? The normal variation doesn't have croziers, but there are other variations (or species?) that do.
Hans-Otto Baral, 04-08-2021 20:39
Hans-Otto Baral
Re : Hymenoscyphus fraxineus? in North America
I put it in my folder caudatus H+ central Europe but wonder why the Vbs are only weakly refractive, similar as oftwn the case in typical H. caudatus.

H. albidus occurs in the US? Not sure if I ever heard of this.
Khomenko Igor, 04-08-2021 22:02
Khomenko Igor
Re : Hymenoscyphus fraxineus? in North America
Thank you very much Martin, Juuso, and especially Zotto. Every time I think I know something you prove me wrong.

I will post about "H. albidus" in a new topic.

Regards,
Igor