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18-09-2025 08:35

Chaetomium
Edmond POINTE Edmond POINTE

Bonjour amis mycologues,Trouvé sur moquette de ch

17-09-2025 19:43

Lachnellula suecica ?
Philippe PELLICIER

Sur branche morte de Mélèze. Les ascospores sphÃ

18-09-2025 19:40

Pulvinula sp
Sylvie Le Goff

BonjourPensez vous que le genre Pulvinula puisse c

18-09-2025 16:14

Literature request
Bernard Declercq Bernard Declercq

Hello,I am looking for a copy of following paper:H

17-09-2025 16:14

Sepultaria ?
Philippe PELLICIER

Apothécies enterrées, fermées au début puis s'

17-09-2025 10:50

Ascomycete on Polystichum proliferum
Heather Merrylees

Hi there!I am hoping for any advice on the identif

11-09-2025 16:57

Marthamycetales revision published
Jason Karakehian Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

16-09-2025 12:53

Encoeliopsis rhododendri
Philippe PELLICIER

Pézizes de 1-4 mm, brun grisâtres, sur les capsu

03-09-2025 12:44

Ascolichen on Blechnum?
Enrique Rubio Enrique Rubio

Hi to somebody.I would like to know your opinion o

15-09-2025 14:40

Engler & Prantl, Nat. Pflanzenfam. (Ed. 2) 1938
Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello.I'm searching for a digital copy of the seco

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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