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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