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Bonjour à toutes et tous,Pourriez-vous m'aider à
Hymenoscyphus s/ Urtica
Luc Bailly,
09-11-2009 21:20
Bonsoir à tous,J'ai un Hymenoscyphus poussant sur tiges mortes d'Urtica dioica, trouvé en Haute Ardenne 5vielsalm, Belgique). J'ai d'abord pensé à Hymenoscyphus herbarum, mais la micro ne correspond pas.
Apothécie -> 1.5 mm sur mes spécimens, crème, jaunissant ou rougissant en vieillissant (photo), à pied très court.
Asques X 6.5-8 µ, sans croziers (du moins je n'en n'ai pas vus dans ma préparation), pore hémiamyloïde (IKI R++, Meltzer B faible).
Paraphyses cylindriques, X 2-3 µ; guttules parfois présentes vers le sommet, parfois pas.
Spores hyalines, 1-septées, 16-23.5 X 3-4.5 µ.
Une idée? Merci d'avance - Luc BAILLY.
Luc Bailly,
09-11-2009 21:22
Re:Hymenoscyphus s/ Urtica
Sommet des asques et paraphyses avec contenu très faiblement réfringent ici.
Luc Bailly,
09-11-2009 21:22
Re:Hymenoscyphus s/ Urtica
Spores
Luc Bailly,
09-11-2009 21:23
Re:Hymenoscyphus s/ Urtica
Hémiamyloïdie.
Nicolas VAN VOOREN,
09-11-2009 22:09
Re:Hymenoscyphus s/ Urtica
Il s'agit plutôt d'un Calycina.
Concernant la définition de l'hémiamyloïdie, je renvoie vers la note de Zotto :
http://www.gbif-mycology.de/HostedSites/Baral/IodineReaction.htm
Concernant la définition de l'hémiamyloïdie, je renvoie vers la note de Zotto :
http://www.gbif-mycology.de/HostedSites/Baral/IodineReaction.htm
Hans-Otto Baral,
09-11-2009 22:33
Re:Hymenoscyphus s/ Urtica
Hi Luc
yes, it is certainly a Calycina, and I would expect C. herbarum. Are you sure the spores are so big?
Zotto
yes, it is certainly a Calycina, and I would expect C. herbarum. Are you sure the spores are so big?
Zotto
Luc Bailly,
09-11-2009 22:40
Re:Hymenoscyphus s/ Urtica
Ah, okay, merci Nicolas. J'essaierai le KOH + IKI aussi.
I still have the specimen and will verify the spore length tomorrow.
I still have the specimen and will verify the spore length tomorrow.
Luc Bailly,
10-11-2009 17:49
Re:Hymenoscyphus s/ Urtica
I can confirm you the spores are that large. Thus, would it be a macrosporic form of C. herbarum?
Et tu as raison, Nicolas: IKI + KOH: réaction négative.
Cheers - LUC.
Et tu as raison, Nicolas: IKI + KOH: réaction négative.
Cheers - LUC.
Hans-Otto Baral,
10-11-2009 18:12
Re:Hymenoscyphus s/ Urtica
Wehn I use my key and assume the asci are 8-spored, with 8 equally-sized spores, then I arrive at Calycina subparilis, an undescribed species which I only know from wood and bark of various angiosperm trees and shrubs. The spores are there 13-20 / 3,3-4,5 µm.
Hier an example.
Zotto
Hier an example.
Zotto
Luc Bailly,
10-11-2009 19:10
Re:Hymenoscyphus s/ Urtica
Thank you, Zotto. Spores are exactly like those ones, and dimensions are very close. But the ecology (herbaceous stems) is different. And the apothecies of my sample are more distinctly cream (could be because they're older).
Hans-Otto Baral,
10-11-2009 20:34
Re:Hymenoscyphus s/ Urtica
I have a photo of another collection with cream apothecia. The colour may depend a bit on the light, but on your photo it is visible that the brownish colour is due to some ageing or pressure.
Zotto
Zotto
Luc Bailly,
12-11-2009 16:21
Re:Hymenoscyphus s/ Urtica
That resembles what I found quite a lot. Thanks!
Cheers - Luc.
Cheers - Luc.