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06-07-2020 05:51

Yulia Lytvynenko

Dear friends.Looking for a copy of the following w

05-07-2020 17:52

Juuso Äikäs

I found these growing on dead, fallen canes of Rub

05-07-2020 18:06

Castillo Joseba Castillo Joseba

Me mandan el material seco de Galicia, recolectado

05-07-2020 10:31

Castillo Joseba Castillo Joseba

me mandan el material de Galicia, recolectado en h

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Thomas Læssøe

see: https://svampe.databasen.org/observations/10

27-06-2020 13:21

Hardware Tony Hardware Tony

I wondered if anyone could help me with this ascom

04-07-2020 14:34

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello, I would like to ask you for help with idet

03-07-2020 21:06

Castillo Joseba Castillo Joseba

me mandan el material seco,, recolectado en plante

03-07-2020 20:54

Castillo Joseba Castillo Joseba

me mandan el material seco recolectado en rama de

03-07-2020 22:51

Viktorie Halasu Viktorie Halasu

Hello,I'd like to ask for help with a lichen. In w

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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