10-06-2026 23:08
éric ROMERO
Bonjour tous, Je vous propose un Mollisia trouvé
10-06-2026 12:54
Steve ClementsBonjour encore, Pouvez-vous m'aider, s'il vous pl
09-06-2026 18:32
Camille MertensSur morceau de roseau immergé 0,5 - 0,7 mm de dia
10-06-2026 21:16
François Freléchoux
Bonsoir,Le dernier du jour, en attendant votre avi
10-06-2026 21:07
François Freléchoux
Toutes les tiges de gentianes jaunes de l'an passÃ
10-06-2026 13:41
François Freléchoux
Bonjour à nouveau, Voici une trouvaille d'hier.
10-06-2026 11:53
Steve ClementsBonjour, This disco is abundant on dead stems of
10-06-2026 10:45
François Freléchoux
Bonjour à nouveau, Encore une détermination qui
08-06-2026 10:16
Spooren Marco
I don`t have a clou about this fungus,it is not in
10-06-2026 09:24
François Freléchoux
Bonjour, J'imagine que cette détermination ne do
Unknown pyrenomycete on Quercus sp.
Maren Kamke,
05-05-2013 20:19
Hello,I found this one on Quercus sp., I think. I first throught it could be Alnus sp. because it lay in water in a "Erlenbruchwald", but there were also some oaks. The wood had no longer bark.
The fruitbodies are to 0,2 mm wide. The spores are big with 41-47 x 9 – 11 µm brown, with 5 septa, the cells on the ends are brighter than the others. The 3rd one slightly larger. Asci IKL negative 153-180 x22-25 µm. Paraphyses thin up to 1,5 µm.
Thank you for your help.
Regards Maren
Jacques Fournier,
05-05-2013 20:31
Re : Unknown pyrenomycete on Quercus sp.
Hi Maren,
this is Trematosphaeria wegeliniana, an aquatic species occurring on submerged wood or wood that has been submerged for long before being found on river banks. The ascospore wall is finely longitudinally striate but not always easy to make out.
Cheers,
Jacques
this is Trematosphaeria wegeliniana, an aquatic species occurring on submerged wood or wood that has been submerged for long before being found on river banks. The ascospore wall is finely longitudinally striate but not always easy to make out.
Cheers,
Jacques
Maren Kamke,
06-05-2013 20:08
Re : Unknown pyrenomycete on Quercus sp.
Hi Jacques,
thank you very much. You are right, the spores are longitudially striate. I overlooked it under the first examination.
Do you know something about the distribution of this fungus? I didn't find it in several databanks.
Regards
Maren
thank you very much. You are right, the spores are longitudially striate. I overlooked it under the first examination.
Do you know something about the distribution of this fungus? I didn't find it in several databanks.
Regards
Maren
Björn Wergen,
06-05-2013 20:37
Re : Unknown pyrenomycete on Quercus sp.
Hi Maren,
look also here:
Trematosphaeria wegeliniana
We'd found this species only once in Saxony (N. Heine), never in my region or somwhere else. You also have to know that I am working on aquatic pyrenomycetes only since last year october. I think T. wegeliniana is not frequent. For more pictures, look for it in the ascofrance database.
regards,
björn
look also here:
Trematosphaeria wegeliniana
We'd found this species only once in Saxony (N. Heine), never in my region or somwhere else. You also have to know that I am working on aquatic pyrenomycetes only since last year october. I think T. wegeliniana is not frequent. For more pictures, look for it in the ascofrance database.
regards,
björn
Jacques Fournier,
06-05-2013 21:06
Re : Unknown pyrenomycete on Quercus sp.
I agree with Bjorn it is not evenly distributed but not rare when present, for example around Niort (western France). I never found it in the Pyrénées where I have been doing extensive collecting of freshwater fungi. It probably has specific ecological requirements that are still unknown.
Maren, take care if you begin to focus on such fungi you will forget about others!
Cheers,
Jacques
Maren, take care if you begin to focus on such fungi you will forget about others!
Cheers,
Jacques
Yannick Mourgues,
07-05-2013 14:08
Re : Unknown pyrenomycete on Quercus sp.
HI.
Found it in Deux-Sèvre in France and in Lozère. Both with ph<7. What about water's ph where you found it, Maren, Björn and Jacques ?
Yannick
Found it in Deux-Sèvre in France and in Lozère. Both with ph<7. What about water's ph where you found it, Maren, Björn and Jacques ?
Yannick
Maren Kamke,
07-05-2013 20:40
Re : Unknown pyrenomycete on Quercus sp.
Hi,
thank you all for your comments.
With a short fungi-season and dry summers in Northern Germany I will probably look for more of these fungi. ... they have such beautiful spores :).
Yannick, I checked the ph in the water today, it is rather acid with 5,8.
Regards
Maren
thank you all for your comments.
With a short fungi-season and dry summers in Northern Germany I will probably look for more of these fungi. ... they have such beautiful spores :).
Yannick, I checked the ph in the water today, it is rather acid with 5,8.
Regards
Maren
Björn Wergen,
07-05-2013 22:31
Re : Unknown pyrenomycete on Quercus sp.
Thats a good question, Yannick, I will ask Norbert Heine to check pH. This would indicate a pH-dependency of aquatic pyrenomycetes. I have already thought about this, especially the appearance of these species in rivers with industrial influence. There is way to go I think :P
regards,
björn
regards,
björn
Alain GARDIENNET,
08-05-2013 07:40
Re : Unknown pyrenomycete on Quercus sp.
Hi friends,
Never found in my calcareous country. I've only one data from Mellasco (79 =Deux-sèvres, cf Yannick's data).
If it could grow in my land, I would have found it.  Â
Alain Â
Björn Wergen,
08-05-2013 16:17
Re : Unknown pyrenomycete on Quercus sp.
Norbert Heine has written me via email, that pH was 7,2.
regards,
björn
regards,
björn
Jacques Fournier,
08-05-2013 17:52
Re : Unknown pyrenomycete on Quercus sp.
no doubt the pH of the water is an important ecological factor for many species but other parameters often make the picture more complicated. For instance I never found T. wegeliniana in my region where acid waters are frequently encountered on the northern slopes of the Pyrénées. I think associations and competitions between fungi also play an important role, much more difficult to evaluate than pH.
Good luck with aquatic ascos to you all!
Cheers,
Jacques
Good luck with aquatic ascos to you all!
Cheers,
Jacques