20-12-2025 23:08
Patrice TANCHAUDBonsoir, récolte sur sol sablonneux dans l'arriÃ
21-12-2025 09:32
Josep Torres
Hello.A tiny ascomycete found embedded in wood in
20-12-2025 15:47
Mirek GrycHi.These grew on pine wood that was heavily covere
18-12-2025 21:17
Pol DebaenstThe identification took me to Byssonectria deformi
15-12-2025 07:09
Danny Newman
indet. Rutstroemiaceae sp. on unk. fallen leavesMc
19-12-2025 10:10
Patrice TANCHAUDBonjour, récolte réalisée en milieu dunaire, a
18-12-2025 17:23
Bruno Coué
Bonjour,je serais heureux d'avoir votre avis sur c
Pyrenomycete causing deformation on Corylus twigs?
Björn Wergen,
02-02-2014 20:12
Hi friends,I have some Corylus twigs here with a deformation caused by small, black pyrenomycetes, which are growing on the deformations, while the twig is still living.
Pseudothecia 0,2-0,35mm, 1/2 embedded into the surface and growing freely later, black, pyriforme, smooth, without ostiolus.
Spores are 20-24x8-10µm, asymmetrical, upper cell broader, generally with three septations, smooth, hyaline. Asci with 8 spores, somewhat saccate, broadest in the middle-lower region, IKI- (red), bitunicate, no stalk, 55-65x17-22µm, without pseudoparaphyses/periphyses. Wall consisting of a 12-15µm thick region of dark brown parenchymatous cells and a ~10µm thick region with paler to hyaline, compressed cells.
Any idea? I thought about Leptosphaerulina, but I did not find any species with the described features.
regards,
björn
Jaklitsch Walter,
02-02-2014 20:49
Re : Pyrenomycete causing deformation on Corylus twigs?
Hi Björn,
based on the image the host is Ulmus minor due to the cork wings (or strips) and alternating twigs. The wings are dead.
The fungus is apparently Saccothecium sepincola, typically occurring on Rosa, although the spore size you give is unusually large.
Regards, Walter
based on the image the host is Ulmus minor due to the cork wings (or strips) and alternating twigs. The wings are dead.
The fungus is apparently Saccothecium sepincola, typically occurring on Rosa, although the spore size you give is unusually large.
Regards, Walter
Björn Wergen,
02-02-2014 21:02
Re : Pyrenomycete causing deformation on Corylus twigs?
Hi Walter,
really Saccothecium sepincola? I thought about that species, but it is described mostly with more than 4 septations. Quite curious...however, thanks for your opinion :)
regards,
björn
really Saccothecium sepincola? I thought about that species, but it is described mostly with more than 4 septations. Quite curious...however, thanks for your opinion :)
regards,
björn
Jaklitsch Walter,
02-02-2014 21:24
Re : Pyrenomycete causing deformation on Corylus twigs?
image 3Â in the middle shows an ascospore with 5 septa, if I see that correctly
The fasciculate asci are also typical.
W.
The fasciculate asci are also typical.
W.
Alain GARDIENNET,
02-02-2014 22:41
Re : Pyrenomycete causing deformation on Corylus twigs?
Hi Björn,
Again Walter is right, I think.
All features fit well with S. sepincola (particularly hamathecium). Generally, it's given on Rosa. But I have already found it on Rubus sp. and Cornus sanguinea.
Alain
Â