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Sur Ombellifère
Michel RIMBAUD,
28-02-2012 12:10
JIl y a une semaine j'ai mis en chambre humide une tige de grosse ombellifère morte (Heracleum ?).
J'observe une colonie de minuscules petites billes noires sur un stipe fin.
Ces têtes noires sont liquides, comme de l'encre noire.
Au microscope j'observe 2 sortes de spores :
- des spores cylindriques noires, à 2 guttules, 3,8 x 16 µ, libres dans le milieu.
- des spores larmiformes hyalines, 5 x 11,8 µ disposées en étoiles comme les pétales d'une fleur, qui me font penser à un Botrytis (?).
Quelqu'un connait-il ce champignon ?
Merci d'avance.
Michel.
Chris Yeates,
28-02-2012 13:00
Re : Sur Ombellifère
bonjour
C'est une espèce de Stachybotrys. Pour nommer l'espèce, il serait utile de connaître les dimensions des conidies et si elles ont toute ornementation.
amitiés
Chris
this is a species of Stachybotrys; to take it to species level one needs to know the dimensions of the conidia (which you have given) and also whether they are ornamented. Species of this genus are frequent colonisers of umbellifers in late winter into spring - Heracleum being a favoured host
Chris
C'est une espèce de Stachybotrys. Pour nommer l'espèce, il serait utile de connaître les dimensions des conidies et si elles ont toute ornementation.
amitiés
Chris
this is a species of Stachybotrys; to take it to species level one needs to know the dimensions of the conidia (which you have given) and also whether they are ornamented. Species of this genus are frequent colonisers of umbellifers in late winter into spring - Heracleum being a favoured host
Chris
Chris Yeates,
28-02-2012 13:25
Re : Sur Ombellifère
looking again at this I suspect it is most likely to be Stachybotrys cylindrospora; this should show some degree of ornamentation - you should be able to see longitudinal striations on the conidia (especially under oil immersion)
Chris
Chris
Michel RIMBAUD,
28-02-2012 13:39
Re : Sur Ombellifère
Hello Chris,
before you 2 nd message arrival I was re-examing my specimen and searching Stachybotrys in Ellis.
Me too I arrived on S.cylindrospora, I agree with you.
The conidiophore is about 5 x 80 µ.
When examining conidia x 100 under immersion I saw (very faintly) somme longitudinal striations, particularly at the ends of conidia, too faint for a good photo, sorry.
Thank you for your help.
Michel
before you 2 nd message arrival I was re-examing my specimen and searching Stachybotrys in Ellis.
Me too I arrived on S.cylindrospora, I agree with you.
The conidiophore is about 5 x 80 µ.
When examining conidia x 100 under immersion I saw (very faintly) somme longitudinal striations, particularly at the ends of conidia, too faint for a good photo, sorry.
Thank you for your help.
Michel