13-02-2026 03:30
Tomaz Vucko
Hello! I found these immersed perithecia on a stic
12-02-2026 21:34
patrice CallardBonjour, la face inférieure des feuilles ce certa
11-02-2026 22:15
William Slosse
Today, February 11, 2026, we found the following R
12-02-2026 14:55
Thomas Læssøehttps://svampe.databasen.org/observations/10581810
11-02-2026 19:28
Lothar Krieglsteiner
on small deciduous twig on the ground in forest wi
25-04-2025 17:24
Stefan BlaserHi everybody, This collection was collected by JÃ
10-02-2026 17:42
Bernard CLESSE
Bonjour à toutes et tous,Pourriez-vous me donner
10-02-2026 18:54
Erik Van DijkDoes anyone has an idea what fungus species this m
09-02-2026 20:10
Lothar Krieglsteiner
The first 6 tables show surely one species with 2
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 fromÂ
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