15-08-2025 12:47
Philippe PELLICIERBonjour, j'ai récolté cette Scutellinia au Col d
15-08-2025 21:50
Bernard CLESSE
Bonsoir à toutes et tous,Pourriez-vous m'aider à
13-08-2025 12:17
Castillo Joseba
De ayer en la misma muestra que el Ascobulus anter
13-08-2025 22:41
Francois Guay
I found this species on decaying wood in Québec,
14-08-2025 17:32
Nicolas VAN VOOREN
Hello.In the course of forthcoming paper about Geo
15-08-2025 07:20
Zuzana Sochorová (Egertová)
Hello, a few days ago I have collected this Tarzet
13-08-2025 12:01
Castillo Joseba
De ayer en KK de vacunoAscas con 20 o mas esporasa
12-08-2025 19:44
Enrique Rubio
Could someone send me a pdf copy of this article?S
11-08-2025 20:31
Jorge HernanzNous avons trouvé cette espèce dans des habitats
Seimatosporium cf. lichenicola on Rosa canina ?
Thorben Hülsewig,
04-05-2018 22:52
today i found this black spots on Rosa canina and i think it may be the genus Seimatosporium. The conidia are only 3-septate and appendages are up to 10 Micrometer long.
Could this be Seimatosporium lichenicola ?
best regards,
Thorben
Joey JTan,
05-05-2018 04:56
Re : Seimatosporium cf. lichenicola on Rosa canina ?
I think of S. lichenicola as having more pigmented, thicker-walled, clavate conidia with wider and darker septa, but your conidia might be young. Seimatosporium lichenicola also often lacks appendages, but your dimensions are similar to those reported by others for this species. I looked at Shoemaker (1964) and didn't find a satisfactory match, e.g. similar to Seimatosporium discosioides except for the appendage length and possibly habit (I'm not sure if S. discosioides is reported from stems). Doesn't match S. rosae either.
Shoemaker, R.A., 1964. Seimatosporium (= Cryptostictis) parasites of Rosa, Vitis, and Cornus. Canadian Journal of Botany, 42(4), pp.411-421.
Chris Yeates,
05-05-2018 17:11
Re : Seimatosporium cf. lichenicola on Rosa canina ?
I too cannot make a satisfactory match; though it surely isn't S. lichenicola, which in my experience usually has collapsed walls.