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22-10-2019 00:02

Yannick Mourgues Yannick Mourgues

On Fagus decorticated wood near a stream. Diametr

21-10-2019 21:53

Markov Sergey

I found small Scutellinia species on very wet very

21-10-2019 19:51

Mirek Gryc

HelloI warmly ask for your opinion on this collect

17-10-2019 17:04

Gilbert MOYNE

Bonjour, Une récolte de mardo 15/10/2019, Réser

21-10-2019 13:06

Castillo Joseba Castillo Joseba

Del pasado martes  en bosque de  piceas y hayasP

21-10-2019 12:53

Castillo Joseba Castillo Joseba

Del pasado Jueves en bosque de piceas, a 1250 m. d

21-10-2019 09:46

Koszka Attila

Dear Forum! Yesterday I found this species, is thi

15-10-2019 21:47

Stephen Mifsud Stephen Mifsud

Hi, my eye fell on a dead stalk of a herbaceous pl

20-10-2019 00:11


Bonsoir sur bois pourrissant de feuillus en ripis

20-10-2019 19:22


Bonsoir à toutes et tous,J'ai trouvé récemment

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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.
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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.
Hans-Otto Baral, 16-06-2019 16:39
Hans-Otto Baral
Re : White Hymenoscyphus on bark
Ah yes, you wrote bark. Bark is not easy to identify. Is there no adherent wood? Fagus bark has a very characteristic inner side.
Nicolas VAN VOOREN, 16-06-2019 17:50
Re : White Hymenoscyphus on bark
Here is a picture of the bark which is layered.
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Hans-Otto Baral, 16-06-2019 18:33
Hans-Otto Baral
Re : White Hymenoscyphus on bark
Ah yes, such bark I know, but not from where :-(

Conifer probably not. And Fagus indeed similar, see here.
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