21-11-2025 11:52
Jean-Luc RangerBonjour à tous, on voit toujours 2 espèces areni
21-11-2025 10:56
Christopher Engelhardt
Very small (~0,5 mm) white ascos, found yesterday
14-11-2025 16:26
Marian Jagers
Hello everyone, On dead wood of Cytisus scoparius
17-11-2025 21:46
Philippe PELLICIERBonjour,Récolté sur bois pourrissant de feuillu
20-11-2025 14:14
Mick PeerdemanFound on the leaves of 'Juglans regia' in the Neth
20-11-2025 13:07
Mick PeerdemanIn January i found these black markings on the dea
Pseudovalsa (?) with conspicuous polar caps
Enrique Rubio,
22-05-2012 14:02
Hi to allI need you help with this Pseudovalsa (?) that grew on, could de, Acer branches. The perithecia are single or in reduced groups under the bark and they open by inconspicuous ostioles.
Ascospores are pseudoseptate without polar germ pores but they have well visible polar caps. Asci with (4)-6-7-8 ascospores. Some spores are bigger or aberrant.
This species fits well with Munk's description of Pseudovalsa cf. umbonata (Danish Pyrenomycetes: 203).
What do you think?
Many thanks in advance
Enrique
Jacques Fournier,
22-05-2012 15:33
Re : Pseudovalsa (?) with conspicuous polar caps
Hola Enrique,
I don't know your fungus but I think it is not Pseudovalsa umbonata which occurs on oak, has a well-defined stroma surrounded by a black wall and a conspicuous blackish disc.
Ascospores of P. umbonata are indeed similar to yours in dimensions but are more distinctly distoseptate and they have more narrowly rounded ends with a hyaline tip and lack appendages.
Walter would be more helpful than me to find a name.
Cheers,
Jacques
I don't know your fungus but I think it is not Pseudovalsa umbonata which occurs on oak, has a well-defined stroma surrounded by a black wall and a conspicuous blackish disc.
Ascospores of P. umbonata are indeed similar to yours in dimensions but are more distinctly distoseptate and they have more narrowly rounded ends with a hyaline tip and lack appendages.
Walter would be more helpful than me to find a name.
Cheers,
Jacques
Jacques Fournier,
22-05-2012 15:41
Re : Pseudovalsa (?) with conspicuous polar caps
two photos of P. umbonata attached
Enrique Rubio,
22-05-2012 17:03
Re : Pseudovalsa (?) with conspicuous polar caps
Thanks, Jacques. As you say my fungus is clearly not P. umbonata
Enrique Rubio,
22-05-2012 17:09
Re : Pseudovalsa (?) with conspicuous polar caps
I have seen close to the fruit bodys pycnidia of the Stegonsporium (?) conidial state?
Jacques Fournier,
22-05-2012 18:11
Re : Pseudovalsa (?) with conspicuous polar caps
Enrique,
I think you should find an answer in the fantastic paper by Voglmayr & Jaklitsch (2008)
Prosthecium species with Stegonsprium anamorphs on Acer, Mycological Research 112: 885-905. Tell me if you don't have it.
Good luck!
Jacques
I think you should find an answer in the fantastic paper by Voglmayr & Jaklitsch (2008)
Prosthecium species with Stegonsprium anamorphs on Acer, Mycological Research 112: 885-905. Tell me if you don't have it.
Good luck!
Jacques
Enrique Rubio,
22-05-2012 18:25
Re : Pseudovalsa (?) with conspicuous polar caps
Thank you Jacques. Please, send me this paper that I need.
Prosthecium seems to be a good solution for my fungus. Some ascospores (< 50%) have a longitudinal distosepta and many of them are abnormal or aborted.
Prosthecium pyriforme is a good answer?
Prosthecium seems to be a good solution for my fungus. Some ascospores (< 50%) have a longitudinal distosepta and many of them are abnormal or aborted.
Prosthecium pyriforme is a good answer?
Enrique Rubio,
22-05-2012 18:37
Re : Pseudovalsa (?) with conspicuous polar caps
After read Voglmayr & Jaklitsch (2008) paper I think my fungus could be Prosthecium pyriforme