
04-06-2025 15:10
Stefan JakobssonHi forum, On a herbaceous stem, possibly Aegopodi

03-06-2025 20:52
Stefan BlaserHello everybody, I didn't get anywhere with this

20-05-2025 22:15

I found this ascomycete at the base of a dead fern

30-05-2025 17:54
Louis DENYHello forum!Touvé près de Belfort, altitude 350m

31-05-2025 00:51
Ethan CrensonHello, Last week in New York City this Orbilia wa
Rutstroemia
Yannick Mourgues,
25-10-2009 01:18

Voici un Rutstroemia trouvé sur branches de Bouleau au sol dans une tourbière.
Ce qui m'étonne, c'est la forme des spores, cylindriques quasiment jamais incurvées comme je pensais les trouver, peut-être à tort d'ailleurs.
La clé que j'ai m'amène à R. firma mais sans conviction toujours à cause de ces spores que je pensais incurvées chez cette espèce.
Micro :
Asques IKI+ bb, 140-160X8-12 um, boucles présentes.
Spores bisériées, cylindriques, 16,9-19,8X5,6-6,5 um avec deux guttules, Q=2,8-3,3
Paraphyses filiformes à apex arrondi, septées, larges de 2-3 um.
Qu'en pensez-vous ?
Merci par avance.
Yannick Mourgues
Hans-Otto Baral,
25-10-2009 07:51

Re:Rutstroemia
Hi Yannick
I know this straight-spored form and never understood if it is the same as the perhaps more often seen curved-spored R. firma. But I saw both forms on Quercus, see DVD, e.g.,Rutstroemia firma cf., 22.9.79.JPG and HB 5372.
Your twigs, are they really Betula? Did you look on the wood whether it is not ring-pored? On your photo I think this could be Quercus.
Zotto
I know this straight-spored form and never understood if it is the same as the perhaps more often seen curved-spored R. firma. But I saw both forms on Quercus, see DVD, e.g.,Rutstroemia firma cf., 22.9.79.JPG and HB 5372.
Your twigs, are they really Betula? Did you look on the wood whether it is not ring-pored? On your photo I think this could be Quercus.
Zotto
Yannick Mourgues,
25-10-2009 12:19

Re:Rutstroemia
Hi Zotto.
Twigs are certainly Betula. There were just Betula and Picea all around this peat bog. But I will see that.
Thank's a lot.
Yannick
Twigs are certainly Betula. There were just Betula and Picea all around this peat bog. But I will see that.
Thank's a lot.
Yannick