30-12-2025 17:14
Bernard CLESSE
Bonjour à toutes et tous,Pourriez-vous aider Albe
29-12-2025 10:15
Hulda Caroline HolteHello, I found and collected this propoloid ascom
30-12-2025 16:44
Pascal DucosBonjour,Une anamorphe rose stipitée, très nombre
30-12-2025 16:41
Pascal DucosBonjour,Une anamorphe rose stipitée, très nombre
30-12-2025 16:41
Pascal DucosBonjour,Une anamorphe rose stipitée, très nombre
30-12-2025 09:04
Josep Torres
Hello.A Pyrenomycete sprouting sparsely but very d
29-12-2025 17:44
Isabelle CharissouBonjour,J'aimerais savoir si d'autres personnes au
12-11-2021 00:03
Lepista ZacariasHi everybody,A week ago in my fiels trip I noticed
Sobre rama muerta de Quercus, puede ser Helminthosporium quercicola?gracias por la ayuda
Hi Angel,
Difficult to distinguish H. quercinum, H. quercicola and H. microsorum only with asexual morph.
Alain
PS Very nice picture !
I wrote quercicola instead of quercinum. I have some immature ascomata and by the sexual morph at the moment I can not identify it.
Thanks again.
Regards
Angel
On which Quercus species? On Quercus ilex in all cases examined we have only seen H. microsorum.
Best, Hermann
Regards
Angel
Asexual morph sporulate in culture?
Thanks Hemann
Regards from
Mallorca
It did not sporulate in our cultures on MEA; however, we didn't try other media. According to our experience the asexual morph is not uncommon but sometimes difficult to see; often there are just slight elevations of the bark, and very commonly the conidiophores grow densely above the ascomata (likewise also in H. quercinum). So it is always a good idea to look beyond elevated bumps bearing fascicles of conidiophores. The ascospores are very diagnostic, by the wavy outline of the inner wall.
Saludos,
Hermann