11-03-2026 17:36
Michel Hairaud
Bonjour, Je cherche des indices pour cette réc
11-03-2026 16:48
Bruno Coué
Bonjour, je serais heureux d'avoir votre avis sur
11-03-2026 14:14
Gernot FriebesHi,I would like to share a collection of Scopinell
10-03-2026 18:08
Marc Detollenaere
Dear Forum,On stems of Arctium, I found some downy
05-03-2026 10:07
Hulda Caroline HolteHello, I found and collected this species growing
07-03-2026 13:06
éric ROMERO
Bonjour tous, Sur cône d'épicea fortement imbu,
Hysterium-like on Fraxinus
Marc Detollenaere,
08-03-2023 23:06
Dear Forum,On Fraxinus I found some elongated black ascomata with hyaline spores, 1 to 3-septate, with warts. They measured 17-18.5x5-5.5µ. The asci were biseriate and measured about 50x8.5µ.
Any suggestions?
Thanks in advance
Marc
Gonzalez Garcia Marta,
09-03-2023 16:10
Re : Hysterium-like on Fraxinus
Hello Marc
Pienso que es un hongo liquenizado. En esta página:
https://italic.units.it/?procedure=idkeys
tiene buenas claves. Le recomiendo la clave 42. Yo creo que su liquen es cercano a Arthonia atra.
Pienso que es un hongo liquenizado. En esta página:
https://italic.units.it/?procedure=idkeys
tiene buenas claves. Le recomiendo la clave 42. Yo creo que su liquen es cercano a Arthonia atra.
Alain GARDIENNET,
09-03-2023 20:51
Re : Hysterium-like on Fraxinus
I've immediatly thought at a lichenized fungus . But we should be able to see the elements a little better.
Alain
Alain
Marc Detollenaere,
10-03-2023 08:11
Re : Hysterium-like on Fraxinus
Thank you for the quick response.
Around the ascomata I only see unbarked wood.Why do you propose an lichenized fungus?
Marc
Around the ascomata I only see unbarked wood.Why do you propose an lichenized fungus?
Marc
Gonzalez Garcia Marta,
10-03-2023 09:26
Re : Hysterium-like on Fraxinus
Hi Marc, lichens are associations between fungi and algae. In his photograph it can be seen that the lirelas settle on a green thallus that in turn grows on wood. There are many lichens whose reproductive structures are hysterothecia: Graphis, Arthonia, Alyxoria, Zwackhia, etc...
In a photo taken from further away, the thallus can be clearly seen.
In a photo taken from further away, the thallus can be clearly seen.
Marc Detollenaere,
10-03-2023 09:50
Re : Hysterium-like on Fraxinus
Thx
Jason Karakehian,
10-03-2023 14:56
Re : Hysterium-like on Fraxinus
That may not actually be a thallus but just bleached wood, the algae that are there may be a casual association. You see this with Mellitiosporium propolidoides and Xerotrema. There is some debate as to whether these fungi are "facultative lichens" that is, they may have some interactions with algae but aren't forming a distinctive thallus. Regardless, the fungus may be treated in the lichen literature, and it may be Ostropales or something in Dothideomycetes.