C'est mon premier message sur le forum. J'ai fait cette observation le 11 avril dernier. En utilisant la clé de Korf (1951), j'arrive à Arachnopeziza trabinelloides. Je n'ai jamais observé de spores à 2 ou 3 septa comme chez A. cornuta. Qu'en pensez-vous? Merci beaucoup pour votre aide!

Cordialement

Arold

Description :
Subiculum présent; blanc
Apothécie : largeur 0,1 – 0,4 mm; orange vif; présence de poils
Asque : largeur 5,2 – 7,8 um; longueur 52,5 – 65,6 um; octosporé; pore apical devenant bleu en ajoutant de l'iode
Spore : longueur 13,1 – 15,7 um; largeur 2,9 – 5,2 um; 1 septa (parfois 0); amincie à une extrémité; hyalin
Paraphyse septées, simple ou branchue
Substrat : Bois en décompostion d'une souche de hêtre (Fagus grandifolia)
Habitat : Érablière à hêtre mature
Lieu : Grande région de Montréal, Québec, Canada.

Hans-Otto Baral, 14-04-2014 20:03

Re : Arachnopeziza trabinelloides ?

Cher Arold

I think you are right with your idea. Only your photos are very small (did you use oil immersion?), so difficult to interpret. I assume you reduced them? 

Zotto

Arold Lavoie, 14-04-2014 20:19

Re : Arachnopeziza trabinelloides ?

Thanks for this quick reply!

Which part of the specimen do you need to see? I can take some bigger pictures (but maximum on this forum is 150 ko, so yes, I reduced them...).

I have a second question. Do you know if A. trabinelloides have ever been observed in Quebec or Canada? I know it was reported in USA (West Virginia, New York, Massachussettes and Vermont).

And if you want a specimen, it will be a pleasure to send it to you.

Thanks!

Hans-Otto Baral, 14-04-2014 20:26

Re : Arachnopeziza trabinelloides ?

Yes, Jules Cimon collected it in 2009, probably around Quebec, maybe it was in this forum (my search option does not work).

Important would be especially the spores mounted in water. The septum is usually well visible in living spores, and also the oil content is important.

I do not believe the restriction, I have no problems to upload larger images. At least when you compress them. or you could cut out elements and present in larger resolution.

Zotto

Arold Lavoie, 14-04-2014 21:21

Re : Arachnopeziza trabinelloides ?

Sorry for the resolution, I cannot make better! :(

Jules Cimon collected Arachnopeziza cornuta, which have 1-3 septa.

https://www.flickr.com/photos/19369983@N06/4553287082/in/photolist-7WmMBG-6p3864-bzPevL-9G3hRE-9FZWxe-9G3hRN-ebJ7om-82E7P6-ebCXux

I look a dozen of apothecia on my specimen and it's always 1 (sometimes 0) septa. 

Thanks!

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Hans-Otto Baral, 14-04-2014 21:23

Re : Arachnopeziza trabinelloides ?

Yes, this looks good: spores without conspicuous oil contetns, septa very well visible.

Zotto