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22-05-2012 14:02

Enrique Rubio Enrique Rubio

Hi to allI need you help with this Pseudovalsa (?

22-05-2012 02:18

Masanori Kutsuna

Dear everyoneI am a Japanese amateur mycologist, t

20-05-2012 15:01

Björn Wergen Björn Wergen

Hi there,does anyone have something about Lecanora

20-05-2012 14:43

Alessio Pierotti Alessio Pierotti

Cari colleghi, qualcuno ha questo articolo ?Erikss

19-05-2012 13:15

maurice pelissier maurice pelissier

Bonjour trouvé hier sur le mont benara discomycte

15-04-2012 05:15

Roland Labbé

Bonjour !Voici un mini disco qui a poussé sur une

16-05-2012 23:39

Marja Pennanen

Hello,the snow has almoust melted away here. Near

01-05-2012 22:00

Björn Wergen Björn Wergen

Hello,I have found a small pyrenomycete with black

11-05-2012 18:36

Bometon Javier Bometon Javier

Buenas tardes a todos.Ascomas de hasta 3mm , copul

17-05-2012 16:56

Alessio Pierotti Alessio Pierotti

Qualcuno degli amici del Forum ha l'articolo:Parbe

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Pseudovalsa (?) with conspicuous polar caps
Enrique Rubio, 22-05-2012 14:02
Enrique RubioHi to all
I 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
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Jacques Fournier, 22-05-2012 15:33
Jacques Fournier
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
Jacques Fournier, 22-05-2012 15:41
Jacques Fournier
Re : Pseudovalsa (?) with conspicuous polar caps
two photos of P. umbonata attached
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Enrique Rubio, 22-05-2012 17:03
Enrique Rubio
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
Enrique Rubio
Re : Pseudovalsa (?) with conspicuous polar caps
I have seen close to the fruit bodys pycnidia of the Stegonsporium (?) conidial state?
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Jacques Fournier, 22-05-2012 18:11
Jacques Fournier
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
Enrique Rubio, 22-05-2012 18:25
Enrique Rubio
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?
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Enrique Rubio, 22-05-2012 18:37
Enrique Rubio
Re : Pseudovalsa (?) with conspicuous polar caps
After read Voglmayr & Jaklitsch (2008) paper I think my fungus could be Prosthecium pyriforme