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Hymenoscyphus sur Rhododendron
Andgelo Mombert,
31-08-2018 09:16
Bonjour à tous,Sur Rhodendron ferrugineum, vers 2000 m d'alt. Tessin, Suisse.
Apothécies de 1-4 mm de diamètre, stipitées.
Ascospores : 13-17 x 4,5-6 µm, elliptiques à cylindriques, parfois avec une face plus aigue que l'autre selon le profil, remplies de fines guttules sauf au centre, hyalines, lisses.
Asques : 115-140 x 7-9 µm, cylindracés, atténués à la base, à sommet amyloïde, avec crochet, contenant huit spores unisériées.
Paraphyses : grêles, dressées, non renflées au sommet, larges de 2-3 µm, garnies de petites guttules.
Je pense être proche de H. calyculus/subferrugineus... Merci pour votre aide.
Andgelo
Hans-Otto Baral,
31-08-2018 09:22
Re : Hymenoscyphus sur Rhododendron
H. subferrugineus is not impossible. usually it has a little more oil in the spores.
Andgelo Mombert,
31-08-2018 11:49
Re : Hymenoscyphus sur Rhododendron
Merci beaucoup pour votre réponse !
Andgelo
Andgelo
Marja Pennanen,
06-09-2018 12:25
Re : Hymenoscyphus sur Rhododendron
Hello,
I have found couple of times this Hymenoscyphuslike fungus on the same area during many years. There has been only a couple of fruitbodies on the twig, so it does not seem very common.
Now I finally decided to determine it. This is 3 mm wide and 4 mm high. The spores are multiguttulate, 14-20x4-5, some have only some big droplets. The paraphyses are multiguttulate and many, propably because of the very dry season here. The asci are about 150x10. From NM1 I found a species, that seemed to fit evenif the asci are too big (should be 90x9-10, but the measurements may have been done from dried specimen). The species is H. subferrungineus. NM1 describes it: Frb stipate, entirely reddish brown, apothecia to 3 mm broad, cup- to disc-shaped. stem 1-3 mm long.
I looked for confirmation from internet and stumbled into this. I'm a bit curious now. Does NM1 have a wrong species, does the nordic variation of this species differ so much in colour or do Hymenoscyphus colour have a wide variation or am I in the woods with my determination or what?
Marja
