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25-02-2023 18:36

Nectria
Elisabeth Stöckli

Bonsoir, Trouvé sur un tronc de Salix recouvert

12-07-2025 16:45

Sur écorce de Hêtre
Thierry Blondelle Thierry Blondelle

Bonjour à tous,J'avais d'abord pensé à des stro

05-07-2025 12:38

Pyrenomycetous fungi on dead Juniperus twig
Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

01-06-2025 09:37

Octospora
Charles Aron Charles Aron

Hi All, I found this Octospora growing with liver

06-07-2025 19:36

Auda con esta
Castillo Joseba Castillo Joseba

me mandan el material de Galicia (España) recolec

07-07-2025 19:22

Ascomycota
David Chapados David Chapados

Hi,Does anyone know what could this anamorph be?ht

02-07-2025 18:45

Sur Osmunda regalis
Elisabeth Stöckli

Bonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

04-07-2025 20:12

Black thready anamorph
Josep Torres Josep Torres

Hello.A fungus growing on the surface of a trunk o

20-06-2025 08:33

Ascomycete on a herbaceous stem.
Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Salvia leaf parasite
Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

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Hysterium-like on Fraxinus
Marc Detollenaere, 08-03-2023 23:06
Marc DetollenaereDear 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
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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.
Alain GARDIENNET, 09-03-2023 20:51
Alain GARDIENNET
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
Marc Detollenaere, 10-03-2023 08:11
Marc Detollenaere
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
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.
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Marc Detollenaere, 10-03-2023 09:50
Marc Detollenaere
Re : Hysterium-like on Fraxinus
Thx
Jason Karakehian, 10-03-2023 14:56
Jason Karakehian
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.