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30-09-2025 20:23

Rot Bojan

Hello!I'm asking for your opinion. I think it's an

30-09-2025 22:08

Philippe PELLICIER

Bonjour, cette Otidea de petite taille de 1-2 cm c

29-09-2025 10:59

Jean-Luc Ranger

Bonjour,  Je ne sais trop où chercher ce champi

28-09-2025 12:30

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello, this fungus nicely fits Lasiosphaeris hirsu

26-09-2025 23:41

Lieve Deceuninck Lieve Deceuninck

Bonjour members du forum. Merci d'avance pour tout

24-10-2024 14:39

Jean-Luc Ranger

Bonjour à tous,Découvert sur un terrain calcaire

26-09-2025 15:51

Jean-Luc Ranger

Bonjour, voici un ascome poussant sur crotte de la

23-09-2025 13:31

Thomas Læssøe

https://svampe.databasen.org/observations/10534623

22-09-2025 20:31

Yanick BOULANGER

BonsoirVoici un ascomycète récolté au alentour

24-09-2025 00:49

Jorge Hernanz

Bonsoir. Estoy estudiando éste diminuto Ascomycet

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Seimatosporium cf. lichenicola on Rosa canina ?
Thorben Hülsewig, 04-05-2018 22:52
Hi there,

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
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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.
Chris Yeates, 05-05-2018 17:11
Chris Yeates
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.