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Bonsoir à toutes et tous,Pourriez-vous m'aider à
Pezizella alniella
Yannick Mourgues,
02-12-2007 19:12
Bonsoir.Voici quelque chose qui approche de Pezizella alniella, mais quelques détails me chiffonnent et j'aimerai votre avis.
D'un point de vue macroscopique, la couleur ne colle pas : blanc pur le jour de la récolte, puis crème et jaunâtre trois jours après conservation au frigo.
P. alniella est je crois crème-jaunâtre dès le début.
D'un point de vue micro, les paraphyses de mes exemplaires sont couvertes à leur sommet de "gel" qui les agglomèrent entre elles. Ce n'est apparemment pas le cas pour P. alniella
Description :
Macro :
Fructifications 0,1-0,5 mm de diamètre, cupuliformes à discoïdes, avec un stipe très court. Sur châtons d'Alnus sp.
Micro :
Spores fusiformes, lisses, hyalines, 2 guttules, parfois bissériées, 10,9-13x2,8-3,4 um
Asques IKI+, 55-69x6-7 um
Paraphyses septées de largeur 2um jusqu'à 3um au sommet, avec gel au sommet comme dit ci-haut.
Ci-joint quelques photos.
Merci par avance.
Yannick Mourgues
Yannick Mourgues,
02-12-2007 20:18
Re:Pezizella alniella
Here is something near Pezizella alniella. What bothers me is that :
1. It's color is cream-yellowish. Mine was white first, and only cream-yellowish after three days in the fridge.
2. Paraphyses of mine are covered at top with something like gel that bind all together. We haven't this for Pezizella alniella.
What do you think about that ?
Description upside.
Thank's a lot.
Yannick Mourgues
1. It's color is cream-yellowish. Mine was white first, and only cream-yellowish after three days in the fridge.
2. Paraphyses of mine are covered at top with something like gel that bind all together. We haven't this for Pezizella alniella.
What do you think about that ?
Description upside.
Thank's a lot.
Yannick Mourgues
Yannick Mourgues,
02-12-2007 20:18
Re:Pezizella alniella
Spores
Yannick Mourgues,
02-12-2007 20:19
Re:Pezizella alniella
Paraphyse
Yannick Mourgues,
02-12-2007 20:19
Re:Pezizella alniella
Paraphyses / gel
Hans-Otto Baral,
02-12-2007 21:05
Re:Pezizella alniella
Dear Yannick
many Helotiales have some gel around their paraphyses which is only seen by certain staining agents. F.ex. in Cresyl blue you often get a lilac stain around the cells of the excipulum and also paraphyses. Anyhow, the paraphyses are separable and do only slightly adhere to each other.
P. alniella is better named Calycellina alniella. A feature typical of that genus but not existent in the close genus Calycina (= Pezizella) is that also the spores are covered by a gel that stains lilac in Cresyl blue, and that often rather strikingly. If you have CRB please test it by adding to a water mount. I have an image of another species (Phialina separablils) showing this feature.
There occur further species on Alnus conse like Calycellina leucella with longer spores, and an undescribed Calycellina with heterosporous asci. From your images I think you have typical C. alniella. If you look at living apraphyses you see Mollisia-like VBs inside, and these cause by oxidation some change to cream-ochraceous of the fresh white apothecia.
Zotto
many Helotiales have some gel around their paraphyses which is only seen by certain staining agents. F.ex. in Cresyl blue you often get a lilac stain around the cells of the excipulum and also paraphyses. Anyhow, the paraphyses are separable and do only slightly adhere to each other.
P. alniella is better named Calycellina alniella. A feature typical of that genus but not existent in the close genus Calycina (= Pezizella) is that also the spores are covered by a gel that stains lilac in Cresyl blue, and that often rather strikingly. If you have CRB please test it by adding to a water mount. I have an image of another species (Phialina separablils) showing this feature.
There occur further species on Alnus conse like Calycellina leucella with longer spores, and an undescribed Calycellina with heterosporous asci. From your images I think you have typical C. alniella. If you look at living apraphyses you see Mollisia-like VBs inside, and these cause by oxidation some change to cream-ochraceous of the fresh white apothecia.
Zotto
Yannick Mourgues,
03-12-2007 00:16
Re:Pezizella alniella
Dear Zotto.
Thank's a lot for these informations.
I try to see this gel around spores with CRB, but I don't see it. The worst of it is that many of them appears to be 1-septate...
I don't understand.
Yannick
Thank's a lot for these informations.
I try to see this gel around spores with CRB, but I don't see it. The worst of it is that many of them appears to be 1-septate...
I don't understand.
Yannick