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31-08-2025 17:32

Michel Hairaud Michel Hairaud

Bonjour, Pas d'identité trouvée pour cette réc

31-08-2025 19:41

Enrique Rubio Enrique Rubio

Hi to someone.I need to download this issue of Sve

31-08-2025 14:34

Thomas Flammer

I have found a Rutstroemia on abt. 2000 m on Alnus

29-08-2025 19:04

Thomas Flammer

Spores 21.2 - 26.2 x 8.3 - 11.3 µm - Q: 2.20 - 2.

30-08-2025 18:29

Joaquin Martin

Hi,I found this undetermined ascomycete on broadle

28-08-2025 17:24

Thomas Flammer

I know, that this is not the real topic of this fo

29-08-2025 05:16

Francois Guay Francois Guay

I think I may have found the teleomorph of Dendros

24-08-2025 21:59

Edmond POINTE Edmond POINTE

Bonsoir amis mycologues,Trouvé sur crottin de che

27-08-2025 12:02

Pavol Palo

Hello dear friendsI would like to ask for sharing

25-08-2025 17:37

François Freléchoux François Freléchoux

Bonjour,Nous avons trouvé samedi dernier à l'ét

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Pyreno with greenish ascospores on Alnus glutinosa
Enrique Rubio, 18-04-2013 19:28
Enrique RubioHi to all

On medium size (40-70 mm in diam.) felled branches of Alnus glutinosa lying on the ground
I have found many inmersed, at first hyaline later greenish, perithecia that no
are into a clearly definited stroma. No ventral black lines. The necks are protruding across a well visible greyish disc.


The asci have an apical refringent apparatus and they are abruptly contracted at their base
(Diaporthales). No paraphyses I have seen. The ascospores are hyaline, later greenish, 1-(0) septate, very polimorphic, with some aberrant forms. No appendages. The spores are surrounded by a gelatinous sheath.


Dispersed between the perithecia they are many inmersed greenish conidiomata that could
be the anamorphic state of this fungus.


What do you think?


Thanks again

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Björn Wergen, 20-04-2013 13:16
Björn Wergen
Re : Pyreno with greenish ascospores on Alnus glutinosa
Hi Enrique,

I have tried to find out your finding for several hours yeasterday, but without success. I think it belongs to Melanconidaceae and probably near Massariovalsa, a genus with quite darker spores. According to Barr 1978 (Diaporthales and its segregates), your fungus matches the genera Massariovalsa, Hercospora and Hapalocystis, this because of the small layer of a gray stromatic tissue right under the surface, embedding the perithecia into wood and not into a stroma. I have also checked several original descriptions of species of aforementioned genera but without any matching conclusion. Probably a new species, perhaps Walter will say something about it :)

btw: you can put this one into the dropbox, too. Many thanks.

regards,
björn