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14-02-2025 23:15

Tomaz Vucko Tomaz Vucko

Hy! Last one for today.How would you identify thi

14-02-2025 21:55

Alan Smith

hello there, this host is a dead stem of Chamerion

14-02-2025 20:15

Tomaz Vucko Tomaz Vucko

Hello! Another species found in the same place as

14-02-2025 19:15

Tomaz Vucko Tomaz Vucko

Hello!I am trying to identify some of the unidenti

14-02-2025 18:31

Francois Guay Francois Guay

Here’s an interesting unidentified ascomycete I

14-02-2025 16:00

Lothar Krieglsteiner Lothar Krieglsteiner

during a workshop on corticiaceous fungi this was

13-02-2025 07:41

Vasileios Kaounas Vasileios Kaounas

first time I encounter it. I didn't expect to see

14-02-2025 12:57

Gernot Friebes

Hello,we are looking for ideas regarding this pyre

14-02-2025 00:22

Jorian Eijkelboom Jorian Eijkelboom

On 6 february 2025 i stumbled upon a leafspot on P

13-02-2025 22:39

Yanick BOULANGER

BonsoirPetits périthèces noirs d'environ 0.5 mm

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Eutypa on Rhamnus
Enrique Rubio, 19-01-2025 19:29
Enrique RubioGood evening to all of you.
I would like to know your opinion, and in particular that of those who are more specifically dedicated to this type of fungi such as Jacques Fournier or Alain Gardiennet, on this Eutypa growing on the wood of Rhamnus alpina, on dead branches still attached to the tree, and at an altitude of 1700 m. The surface is blackened and the ostioles, which reach 300 microns in diameter, barely protrude and they are conspicually cruciform.
The perithecia are about 500 microns in diameter and the asci have a negative or only very weakly positive subapical ring in both Mlz. and IKI.
In an unpublished Fournier's key I find an Eutypa rhamnicola, a species that seems not yet formally described, which looks quite similar despite their slightly wider spores.
Many thanks in advance for your help.
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Jacques Fournier, 19-01-2025 20:42
Jacques Fournier
Re : Eutypa on Rhamnus
Hola Enrique,
indeed your data fit well what Christian and I called Eutypa rhamnicola. Repeatedly collected on R. alpina over 1000m, just like you.
It remained an unfinished project, like many others, by lack of molecular support and time, and I encourage you to take over. There is still a lot to do on Eutypa.
I found the most diagnostic morphological feature of this species is the long neck in relation with the relatively deeply immersed perithecia. Such a configuration is only encountered in E. maura, otherwise easily distinguished. And I agree the apical ring is very small and amyloid
Let's keep in touch!
Un abrazo,
Jacques


Enrique Rubio, 20-01-2025 19:41
Enrique Rubio
Re : Eutypa on Rhamnus
Thank you once again, Jacques.
I would like to ask you another question: do you really see clearly that the apical apparatus of the asci is amyloid? I have not been as clear as you, neither in Melzer nor in IKI.
Yes, it is very sad that Christian is no longer with us.