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
12-04-2026 15:52
Gernot FriebesHi,I'm looking for help with this anamorph collect
14-04-2026 21:52
Gernot FriebesHi,found on dead leaves of Carex elata. Conidia: 4
16-04-2026 22:09
Buckwheat PeteHello, I'd like to ask about this older specimen:
Xylaria aff. cinerea from Ethiopia with strange porus reaction (hemiamyloid?)
Andreas Gminder,
30-01-2020 22:56
Hello dear collegues,on re-examining my collections from the ethiopian rain forest, I came to this little Xylaria species which I can not identify.
Fruitbody club-shaped with distinct stalk, appr. 4 cm high (2 cm club, 2 cm stipe), greyish, with distinct black squamules dispersed on the club. Growing on very mossy wood.
Asci very long-stalked, 8-spored. Apical pore higher than broad, appr. 5 µm high, very distinct even in water. Spores dark brown, 23-28 x 7,8-8,2 µm, with sigmoid germ-slit not reaching the spores ends (appr. 15 µm long, ending 6-7 µm bevor the spore end)
Also it had a strange porus reaction, being blue in Lugol, redbrown in Melzers, violett in Lugol with KOH pre-treatment. When to the lugol preparation (blue reaction) KOH is added, the reaction vanishes completely. Is this called a hemiamyloid reaction?
ANy suggestions?
thank you and all the best,
Andreas
Jacques Fournier,
31-01-2020 15:07
Re : Xylaria aff. cinerea from Ethiopia with strange porus reaction (hemiamyloid?)
Hi Andreas,
from your photos and observations, I would suggest X. schweinitzii as the closest species, with some small differences in superficial coating and spore shape, but X. schweinitzii is widely distributed in Tropics and fairly variable.
I do not think the ascus plug can termed hemiamyloid but the reactions you got are unusual in Xylaria, especially the reaction with Melzer.
if you have the possibility to have this sample cultured and sequenced, a comparison with X. schweinitzii might be worth it.
Cheers,
Jacques
Andreas Gminder,
31-01-2020 21:55
Re : Xylaria aff. cinerea from Ethiopia with strange porus reaction (hemiamyloid?)
Dear Jacques,
merci beaucoup!
Xylaria schweinitzii would be a little bit disappointing. I thought it to be something "better", as the surface of the club didn't look anything like schweinitzii.
Marc Stadler offered me to culture the species and a sequence is done at the moment in Senckenberg anyway. So I will compare and let you know.
all the best,
Andreas
merci beaucoup!
Xylaria schweinitzii would be a little bit disappointing. I thought it to be something "better", as the surface of the club didn't look anything like schweinitzii.
Marc Stadler offered me to culture the species and a sequence is done at the moment in Senckenberg anyway. So I will compare and let you know.
all the best,
Andreas