21-04-2026 13:36
Gernot FriebesHi,I am out of ideas for this one. I collected Sal
21-04-2026 13:19
Gernot FriebesHi,this Lophodermium on Typha has ascospores measu
21-04-2026 13:05
Gernot FriebesHi,this hyphomycete feels familiar but I was not a
20-04-2026 22:00
Malcolm Greaves
These pale yellow, hairy ascos were growing on cul
19-04-2026 21:23
Steve ClementsBonjour, I found this anamorphic fungus on old pl
19-04-2026 20:46
Steve Clements1 mm diameter approx spherical conidiophores on pl
12-04-2026 17:56
Hardware Tony
Found on dead stems in February earlier this year
17-04-2026 19:16
Enrique Rubio
Hi to everybodyI would appreciate any assistance r
14-04-2026 05:32
Ethan CrensonHi all, A few weeks back a friend pointed out som
17-04-2026 15:14
Bruno Coué
Bonjour.Récoltes du 16/04/2026, sur feuilles mort
I found this stromatic fungus growing on the wood of _Castanea sativa_. The stroma is brown and exsudes a red pigment in KOH. The asci are very long
and thin, up to 150 x 6 µm, unitunicate, apically amyloid, and contain 8-spores each, uniserially arranged at the top. The spores are one-celled, hyaline when
young and soon brown, guttulate, with the following dimensions:
(6.7) 6.9 - 7.7 (8.1) × (3.3) 3.5 - 4.1 µm
Q = (1.8) 1.81 - 2.1 (2.2) ; N = 27
Me = 7.4 × 3.8 µm ; Qe = 1.9 ,
which are much smaller than my previous observations of similar fungi. Can someone help me in give it a name?
Thanks in advance,
zaca
it fits well Annulohypoxylon minutellum, formerly known as Hypoxylon cohaerens var. microsporum.
Jacques
The size of the spores troubled me.
Best wishes,
zaca
D'accord pour Annulohypoxylon minutellum mais le support m'intrigue. J'ai souvent récolté cette espèce mais toujours sur Quercus sp.
Amicalement
Paul
cheers
After the proposal of Jacques, I looked for more information about this species and in the description of Hypoxylon cohaerens at the webpage "Pyrenomycetes from southwestern France"
http://pyrenomycetes.free.fr/hypoxylon/html/Hypoxylon_cohaerens.htm
I found the following text that I quote:
"Notes: Hypoxylon cohaerens is a common saprophyte of beech forests, characterized by black pulvinate stromata constricted at base with papillate ostioles. Two other taxa, H. cohaerens var. microsporum and H. multiforme, share similar stromatal features, and field identification relies mainly on host identification: H. cohaerens is restricted to Fagus while H. cohaerens var. microsporum is restricted to Quercus and Castanea and H. multiforme grows mostly on Betula, Alnus and Corylus. However, one collection made on Ligustrum vulgare, a member of Oleaceae, [Hautes Pyrénées (65), Bagnères de Bigorre, L'Arbizon, 04 Sept. 2002, JF-02154, leg. FC] proves that host specificity is rarely absolute."
From it I infer that Castanea sativa is a common host for Annulohypoxylon minutellum (formerly known as Hypoxylon cohaerens var. microsporum, as Jacques mentioned). Am I wrong?
Best wishes,
zaca
Hi together,
what grows on Quercus also grows on Castanea. There is no fungus I know (mycorhizal or saprotrophic) growing with/on Quercus that does not grow with/on Castanea. Example: even the typical Castanea-fungus Rutstroemia echinophila can be found on Quercus leaves and cupules.
Regards from Lothar
Best wishes,
zaca