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sur Abies
Jean Pierre Dechaume,
14-02-2009 09:08

et d'autres, dont celui-ci, qui chassent les anciennes déterminations inachevées... trop de...tue.
Minuscule, 1mm de diam quand je l'écrase entier sous la lamelle, peu nombreux, moins de 10 ex, éparpillés. Aspect de Durella, sans pied, à peine fixé au support, non coriace.
Je n'ai pas trouvé sur Ellis qcq chose d'approchant, ou alors à spores uniseptées et plus grandes.
Sans doute pas spécifique du sapin.
Au melzer, réaction extravagante.
Spores brunes, 11-13 x 4 μ dans des asques en sac , paraphyses monoliformes, avec pommeau arrondi élargi jusqu'à 3 μ. coiffe sombre parfois.
Merci pour l'orientation et bonne journée
jean pierre
Hans-Otto Baral,
14-02-2009 21:22

Re:sur Abies
Dear Jean Pierre
sorry for delayed answer. This is a Dactylospora, a non-lichenized xerotolerant Lecanoromycete. The asci resemble Lecanorales but they have no tholus (amyloid internat apical thickening), but instead a thick amyloid cap. Here is the use of Melzer not bad becaus Lugol rapidly causes overstaining. Anyhow, the lateral ascus wall is hemiamyloid (red in Lugol, inamyloid in Melzer).
About the species: I have seen a lot of collections with such 3-septate spores, on various coniferous and mainly angiosperm substrate, from Europe, Macaronesia and N-America. No idea about a good name for it. The genus is badly studied, only lichenicolous members appear to be better known.
Zotto
sorry for delayed answer. This is a Dactylospora, a non-lichenized xerotolerant Lecanoromycete. The asci resemble Lecanorales but they have no tholus (amyloid internat apical thickening), but instead a thick amyloid cap. Here is the use of Melzer not bad becaus Lugol rapidly causes overstaining. Anyhow, the lateral ascus wall is hemiamyloid (red in Lugol, inamyloid in Melzer).
About the species: I have seen a lot of collections with such 3-septate spores, on various coniferous and mainly angiosperm substrate, from Europe, Macaronesia and N-America. No idea about a good name for it. The genus is badly studied, only lichenicolous members appear to be better known.
Zotto
Jean Pierre Dechaume,
14-02-2009 21:37

Re:sur Abies
Merci beaucoup Zotto,
C'est un plaisir de vous lire et d'essayer de comprendre.
J'étais en train de regarder votre DVD quand votre message est arrivé...
A une autre occasion sûrement.
Bonsoir,
jean pierre
C'est un plaisir de vous lire et d'essayer de comprendre.
J'étais en train de regarder votre DVD quand votre message est arrivé...
A une autre occasion sûrement.
Bonsoir,
jean pierre