Dothideomycete - Forum ASCOFrance

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Dothideomycete

Andrés Valverde Valera, 19-12-2016 22:37

Bonjour,
Je vous ajoute quelques photos d'un dothideomycete (comme m'a dit le camarade Enrique Rubio), que j'ai trouvé le 5 décembre près de l'étang du Banyoles sur bois morte de possible Salix. Les pseudotecia? qui sont tuberculées mesurent 160 ?m aprox. J'ai pu regarder les spores, qui mesurent 14,4 x 4,8 micres.
J'espère que vous pouvez m'aider à déterminer de quelle espèce il s'agit.
Merci beaucoup d'avance,

Andrés Valverde Valera
El Prat de Llobregat (Barcelona)

PD. Excusez-moi mes possibles fautes d'orthographe.

Gernot Friebes, 19-12-2016 22:46

Re : Dothideomycete

Hi,

could you elaborate a bit on the form of the ascomata? Is it possible that they grow on old stromata of Hypoxylon?

Best wishes,
Gernot

Alain GARDIENNET, 19-12-2016 23:40

Re : Dothideomycete

You think at Immotthia, Gernot, right ?

Gernot Friebes, 19-12-2016 23:46

Re : Dothideomycete

Hi Alain,

indeed, that was my first impression...

Best wishes,
Gernot

Andrés Valverde Valera, 19-12-2016 23:58

Re : Dothideomycete

Hi Gernot,

I prefer to send to you a picture that I have just took under the microscope of these ascomata, that are tuber-form, distributed especially in the periphery of the fruiting bodies.

At first I thank in Hypoxylon serpens, for the shape of the mushroom, but I haven't found spores like those of Hypoxylon. Although I have to say that I have found an another kind of spores while searching the asci, that I attach in the second picture.

Best whishes,
Andrés

Alain GARDIENNET, 20-12-2016 00:03

Re : Dothideomycete

Andrés, the solution is perhaps there : http://www.ascofrance.fr/search_recolte/3004.

Alain

Gernot Friebes, 20-12-2016 00:05

Re : Dothideomycete

Hi Andrés,

yes, that looks very much like Immotthia atrograna on Hypoxylon sp. On your last photo you show the conidia of this species.

Best wishes,
Gernot

Andrés Valverde Valera, 20-12-2016 00:15

Re : Dothideomycete

Thanks you so much Alain and Gernot!!!

I've seen the subject "sur hypoxylon / 2. pyreno noir" and I also think that I have found the anamorphe (Sphaeropsis parasitans) but I will write only Immothia atrograna bescause I understand that they are their conidia.

Thank you very much for your help! Without you I would never have determined this species. Muchas gracias!!

Andrés

Jaklitsch Walter, 21-12-2016 19:31

Re : Dothideomycete

http://www.zobodat.at/pdf/OestZPilz_11_0093-0106.pdf

Hello, here is a little paper about Immotthia. I hope that the link works. Cheers, Walter

Andrés Valverde Valera, 21-12-2016 22:35

Re : Dothideomycete

Hello Walter,

Yes, the link works! And I have found another very recent in researchgate,
https://www.researchgate.net/publication/299423764_Immotthia_atrograna_Dacampiaceae_Ascomycota_a_new_for_Ukraine_fungicolous_fungus_from_the_Carpathians

Thanks you so much,

Andrés Valverde Valera

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