03-02-2026 20:44
Zetti MarioWhen I first saw this white mould on an Agaricus s
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Lothar Krieglsteiner
.. 20.7.25, in subarctic habital. The liverwort i
02-02-2026 21:46
Margot en Geert VullingsOn a barkless poplar branch, we found hairy discs
02-02-2026 14:55
Andgelo Mombert
Bonjour,Sur thalle de Lobaria pulmonaria.Conidiome
02-02-2026 14:33
Andgelo Mombert
Bonjour,Sur le thalle de Peltigera praetextata, ne
31-01-2026 10:22
Michel Hairaud
Bonjour, Cette hypocreale parasite en nombre les
02-02-2026 09:29
Bernard CLESSE
Bonjour à toutes et tous,Pour cette récolte de 2
01-02-2026 19:29
Nicolas Suberbielle
Bonjour, Marie-Rose D'Angelo (Société Mycologiq
31-01-2026 09:17
Marc Detollenaere
Dear Forum,On decorticated wood of Castanea,I foun
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