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Thomas Læssøehttps://svampe.databasen.org/observations/10527903
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Dothideomycete on Clematis
Hans-Otto Baral,
14-07-2008 10:57
Bon jourfrom La Dame de Chambrille, thick Clematis branch 1.8 m above ground, decorticated, very rotten, soc. Hyalorbilia guttulata (leg. Stip Helleman).
Bitunicate ascomycete with smooth perithecia and muriform hyaline spores *48-50 x 12.5-13.5 µm.
has anybody any idea?
Zotto
Hans-Otto Baral,
14-07-2008 10:58
Re:Dothideomycete on Clematis
microscopy
Christian Lechat,
14-07-2008 12:32
Re:Dothideomycete on Clematis
Hi Zotto,
did you look for in the Pleomassaria genus?
did you look for in the Pleomassaria genus?
Hans-Otto Baral,
17-07-2008 10:54
Re:Dothideomycete on Clematis
Hi Christian
For Pleomassaria I find only two species (in Munk), with brown spores. Can you tell me any literature? Maybe my species gets brown spores when overmature?
Zotto
For Pleomassaria I find only two species (in Munk), with brown spores. Can you tell me any literature? Maybe my species gets brown spores when overmature?
Zotto
Christian Lechat,
17-07-2008 11:45
Re:Dothideomycete on Clematis
Hi, Zotto,
I send a key of Pleomassaria species to you.
I send a key of Pleomassaria species to you.
Hans-Otto Baral,
19-07-2008 21:25
Re:Dothideomycete on Clematis
Hi Christian
I have problems with that genus. The spores of Pleomassaria are brown at maturity, very thick-walled with "ocellate" cell lumina, and a sheath around. Also the perithecia are subperidermal and host- specific. Here my old drawing from DVD (Pleomassaria carpini, HB 1601.jpg). With your key I don't arrive at a good result.
I have problems with that genus. The spores of Pleomassaria are brown at maturity, very thick-walled with "ocellate" cell lumina, and a sheath around. Also the perithecia are subperidermal and host- specific. Here my old drawing from DVD (Pleomassaria carpini, HB 1601.jpg). With your key I don't arrive at a good result.
Hans-Otto Baral,
19-07-2008 21:31
Re:Dothideomycete on Clematis
Here images of the asci of the Clematis find, this time in dead state (KOH, KOH + IKI). Asci are 4-8-spored, Dead spores measure 43-55 x 11-13 µm. Perith. 0.3-0.4 mm diam., somewhat conical. The lipid in the spore cells is fused to one globose LB while the cell wall is difficult to see but clearly thin-walled.
Zotto
Zotto
Hans-Otto Baral,
19-07-2008 21:34
Re:Dothideomycete on Clematis
Perithecium in section (difficult because carbonaceous)
Christian Lechat,
20-07-2008 10:42
Re:Dothideomycete on Clematis
Ho yes, hyalin ascospores , so, you should look in Macrospora and Pyrenophora genera
Hans-Otto Baral,
26-07-2008 13:06
Re:Dothideomycete on Clematis
I sent my images to Walter Jaklitsch, and he suggested that the collection fits best to Teichosporella cervariensis Sacc. et Berl. (figured in Berlese). But I did not yet see this description. He also mentioned that Macrospora, Pyrenophora, Leptosphaerulina, Wettsteinina, Pseudoplea, etc.
grow on grasses and leaves, have minute ascomata with only few asci,
and spores with mostly few septa and getting brown at least with age
Zotto
grow on grasses and leaves, have minute ascomata with only few asci,
and spores with mostly few septa and getting brown at least with age
Zotto
Christian Lechat,
26-07-2008 15:46
Re:Dothideomycete on Clematis
the ascomata of Teichosporella are "apothecioid" according to M.E. Barr, it's why I asked a section to you. Berlese watch of perithecioid ascomata, there is a problem!!
There are numerous features in you collection which fits to this genus, specialy the ascospores but I don't know if it is Teichosporella genus.
Christian
There are numerous features in you collection which fits to this genus, specialy the ascospores but I don't know if it is Teichosporella genus.
Christian
Hans-Otto Baral,
26-07-2008 17:19
Re:Dothideomycete on Clematis
Oh thanks, I received only the text, here it is.
Walter suggested the genus Julella as a first place for this cervariensis, a genus which comprises also lichenized taxa.
Zotto
Walter suggested the genus Julella as a first place for this cervariensis, a genus which comprises also lichenized taxa.
Zotto
Christian Lechat,
26-07-2008 18:18
Re:Dothideomycete on Clematis
did you see a gel coating around the ascospore? because it is a feature of Julella genus
Hans-Otto Baral,
26-07-2008 22:42
Re:Dothideomycete on Clematis
As visible on the water mounts made in Melle, there is no perceptible gel sheath.
Zotto
Zotto