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Mot de passe perdu? S'inscrire

06-11-2025 16:50

Rot Bojan

Hello! Yesterday I found a fungus on or near a nee

04-11-2025 14:53

Josep Torres Josep Torres

Hello.Very small, globose, mucronate perithecia, b

05-11-2025 11:33

Pierre Repellin

Bonjpur,J'ai trouvé, sur une hampe florale d'Alli

04-11-2025 09:07

Josep Torres Josep Torres

Hello.A suspected Hymenoscyphus sprouting on a thi

04-11-2025 12:43

Edvin Johannesen Edvin Johannesen

Hi! One more found on old Populus tremula log in O

03-11-2025 21:34

Edvin Johannesen Edvin Johannesen

These tiny (0.4-0.5 mm diam.), whitish, short-stip

03-11-2025 19:41

David Chapados David Chapados

Hi,Does anyone knows which genus could this be? G

28-10-2025 15:37

Carl Farmer

I'd be grateful for any suggestions for this strik

03-11-2025 16:30

Hans-Otto Baral Hans-Otto Baral

Hello I want to ask you if you have found this ye

01-11-2025 09:14

Francis Maggi

Bonjour,Trouvé sur Xanthoria parietina à Valdebl

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Rutstroemia? sobre madera
Rubén Martínez-Gil, 17-09-2017 12:05
Rubén Martínez-Gil

Hola a todos.


Subo unas fotos de una Rutstroemia? que encontré ayer sobre ramitas sin identificar, en bosque mixto de F sylvatica-Q pyrenaica, entre otros.


Esporas de 20-23 x 5,3-6,2 micras.


Ascas amiloides, pleurorrincas.


¿Qué les parece?


Gracias por su ayuda.


Rubén

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Hans-Otto Baral, 17-09-2017 13:15
Hans-Otto Baral
Re : Rutstroemia? sobre madera
Great! Rutstroemia for sure, but I do not remember such with navicular spores.

Quercus and Fagus you should be able to distinguish with the wood pores (ring-pored or not).  Did you look at a broken twig?

Zotto
Martin Bemmann, 17-09-2017 13:28
Martin Bemmann
Re : Rutstroemia? sobre madera
Why not R. firma? esp. when Quercus is possibly involved. See White's drawing attached.

Regards
Martin
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Hans-Otto Baral, 17-09-2017 13:33
Hans-Otto Baral
Re : Rutstroemia? sobre madera
You are right, Martin, my impression was that the spore ends are acute, but they are rather obtuse. 

The strange thing is that R. firma usually has curved spores, but I saw also populations with straight spores. These here are completely straight. I wonder if this is all the same.

R. firma was also mixed with R. alnobetulae in earlier times, who knows how many taxa exist.

I suspect that DNA would help....
Zotto
Martin Bemmann, 17-09-2017 13:42
Martin Bemmann
Re : Rutstroemia? sobre madera
The spores in Rubén's collection seem to have a sheath (fig. 6). Is this confirmed for R. firma?
Hans-Otto Baral, 17-09-2017 16:53
Hans-Otto Baral
Re : Rutstroemia? sobre madera
Such sheath has almost every Sclerotiniaceae and Rutstroemiaceae, and not only.
Rubén Martínez-Gil, 18-09-2017 17:52
Rubén Martínez-Gil
Re : Rutstroemia? sobre madera

Gracias por su ayuda, Zotto, Martin.


Subo unas fotos del palito donde las encontré. Mide 5 mm de diámetro. No tengo claro que sea de Quercus o Fagus.


La dejo de momento como R firma.


Saludos


Rubén

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