13-09-2025 14:10
Wim de GrootWe found this hymenoscyphus on rubus fruticulosis.
11-09-2025 16:57
Jason Karakehian
Our revision of Marthamycetales (Leotiomycetes) is
13-09-2025 14:01
Thomas Flammerdark brown apothecia, splitIKI-Spores biguttulate
10-09-2025 23:53
Marcel Heyligen
Found on Robinia pseudoacasia together with Diapor
10-09-2025 17:18
Blasco Rafael
Hola, encontre este estiercol de vaca estos apotec
02-09-2025 11:34
Thomas Læssøehttps://svampe.databasen.org/observations/10527903
Found on a fallen branch of oak. The wood is colored black and the stromata has a stipe of 8x1 mm and a fertile part of 11x2.5 mm. The outer crust is hard and black with grey patches and lumpy as a result of the underlying perithecia.
TELEMORPHE:
Perithecia: subglobose 514 x 400 µm
Asci: cylindrical 124-158 x 8-9,65 µm
Paraphyses: filiform
Spores: 11,35-13,37 x 5,14-5,94 µm Q= 2.23 with straight germsplit (spore lenght 11.2 µm with germsplit length 7.85 µm)
ANAMORPHE: flat length 5-8 mm; conidia:10,41-16,3 x 3,02-3,86 µm
Macroscopic/microscopic this frb looks like Xylaria arbusula except the length of the asci is wrong and I found it in Belgium/Turnhout in winter! Is this not a tropical asco?
I will be grateful for your help!
Greetings,
François Bartholomeeusen
your images do not allow an identification.
Before considering X. arbuscula you should rule out X. hypoxylon. The key feature distinguish them is the thickness and texture of the outer crust. See my notes in the monographic keys available on Ascofrance.
Good luck,
Jacques
I have made the wrong choice at step 2 of your superb key. I chose "Stromata hard-textured with a carbonaceous outer crust".
Perhaps the persistent, drying east wind, the sun and the freezing temperature changed the texture a bit? In all cases reading your notes has shed light on my problems. I have also measured the out crust and is was about 40-45 µm thick.
Thank you for your quick reaction!
Cordial greetings,
François