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16-06-2019 11:54


Hello.Here is a Hymenoscyphus species growing on b

16-06-2019 12:07

Riet van Oosten Riet van Oosten

Hello, Found by Theo Westra, 13-06-2019 (The Neth

14-06-2019 15:32

Malcolm  Greaves Malcolm Greaves

A small group of Perithecia on rotten (salix?) woo

14-06-2019 09:40

Per Marstad Per Marstad

I have found this in Norway, on hardwood, laying o

14-06-2019 06:40

Django Grootmyers

What is this parasite of Cantharellus minor? Found

11-06-2019 01:49

Valencia Lopez Francisco Javier

Hola amigos...Adjunto fotos de unas supuestas Para

11-06-2019 00:32

Elisabeth Stöckli

Bonsoir, Sur feuilles de ronce (Rubus/roncier à

11-06-2019 16:20

Garcia Susana

Hola, He recolectado este asco sobre estiercol, c

12-06-2019 22:42

Ethan Crenson

Hello all, A friend noticed these tiny fruiting b

11-06-2019 00:08

Ethan Crenson

Hello all, I found a few of these tiny black cush

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White Hymenoscyphus on bark
Nicolas VAN VOOREN, 16-06-2019 11:54
Nicolas VAN VOORENHello.
Here is a Hymenoscyphus species growing on bark (probably Fagus) in a wet place.
Apothecia Ø 1-1.8 mm, sessile or short-stalked, pure wihite.
Ectal excipulum of t. prismatica.
Asci without crozier, pars sporifera 26-32 µm, IKI+ (bb)
Paraphyses without VB
Ascospores 11-14 (18) × 3-4 µm, sometimes with a septum (only when ejected), OCI 1-2.

H. phyllogenus seems close, but the substrate is different.
  • message #58136
  • message #58136
  • message #58136
Hans-Otto Baral, 16-06-2019 12:21
Hans-Otto Baral
Re : White Hymenoscyphus on bark
Hi Nico

this reminds me strongly of my Hymenosc./Phaeohelotium "Cagne" on coniferous wood. See my folder "monticola".

The VBs in the paraphyses are multiguttulate and vary between faintly and medim refractive.

So far 3x on coniferous wood in Vosges.

Did you look for the wood anatomy? In cross section coniferous wood is easily determined, and Fagus also.
Nicolas VAN VOOREN, 16-06-2019 12:45
Re : White Hymenoscyphus on bark
Not easy to study the anatomy of rotten bark... As there were some Picea abies in the same place, this is an option.
I agree that this H. "Cagne" could fit, although the VB in the paraphyses are not so distinct in my collection.