rebondissement,après différentes recherche sur le net,j'ai trouvé un forum ou une personne a la même cyathea?
voici le lien
http://www.cemunnos.nl/forum/index.php?page=Thread&threadID=9840
ce lien néerlandais m'a remis vraiment dans le doute.
dans le file de discution ,cette personne a adressé un mail au responsable(expert en fougères arborescentes) de www.dicksonia.com voici sa réponse:
Your close-up photos of the new tree fern now make the task of identifying it a little easier - at least we can say with certainty that it is NOT Cyathea australis.
So what species is it, exactly? If it wasn't for the clearly visible conical spines in your photo above, I would be more confident of saying it was one of the many variants of Cyathea cooperi. I've come across many smooth-stiped cooperi, and also many rough-stiped cooperi. But I've never seen actual spines before! Hmmmmm, that is confusing! I think it's possible you have some other type of Cyathea there, which frequently happens with spore-propagated nursery tree ferns. It's very difficult to get tightly packed glasshouse tree ferns to grow true to type when there are so many possibilities for cross-contamination - regardless of the nursery label, the majority of apparently desirable Cyatheas usually turn out to be cooperi, simply because the spore will out-compete just about any other species it becomes mixed with.
Anyway, not an australis.
bref en gros il dit que cette cyathea n'est pas une australis mais peut-être une variante de cooperii ou encore mieux cela peux-être un croissement de spores ?
donc ma cyathea n'a toujours pas d'identitée
elle restera en pots tant que l'identification n'est pas sur à 100%
j'attends vos avis
a+cyr59