Odontotrema minus - Forum ASCOFrance

13-01-2026 09:10

Dasyscyphella chrysotexta on indet. decorticate hardwood - 305874978

Danny Newman

Dasyscyphella chrysotexta on indet. decorticate ha

13-01-2026 08:49

Coccomyces sp. on fallen Rhododendron leaves - 305874978

Danny Newman

Coccomyces sp. on fallen Rhododendron leavesPretty

13-01-2026 08:43

Tricladium varicosporioides on indet. decorticate stick - 303997395

Danny Newman

Tricladium varicosporioides on indet. decorticate

12-01-2026 22:02

Coryneum (?) acervuli on oak (?) branch

Ethan Crenson

Hello all, I am hoping someone will have some ins

13-01-2026 07:57

cf. Bombardia on indet. decorticate wood - 304222307

Danny Newman

cf. Bombardia on indet. decorticate woodAppalachia

13-01-2026 07:51

Atrocalyx sp. on indet. herbaceous stem - 303869374

Danny Newman

Atrocalyx sp. on indet. herbaceous stemAppalachian

13-01-2026 07:28

Chlorociboria glauca on indet. decorticate hardwood log - 303627368

Danny Newman

Chlorociboria glauca on indet. decorticate logThe

13-01-2026 07:14

Neodasyscypha cerina on indet decorticate log - 303463318

Danny Newman

Neodasyscypha cerina on indet decorticate logThe S

11-01-2026 20:35

Pyrenomycete on Conifer Wood

Josep Torres

Hello.A very tiny pyrenomycete sprouting sparsely

12-01-2026 05:24

Cyathicula coronata on Urtica dioica - 303628165

Danny Newman

Cyathicula coronata on Urtica dioicaCataloochee Di

Odontotrema minus

Nina Filippova, 26-01-2013 18:32

Odontotrema minus - probably, since it has broad asci, thick apical cap which deffusely J+ blue, spores ovoid, and apothecia immersed in wood, hemispherical, with serrate pore.

It grew on decorticated bleached wood of standing-dead pines (Pinus sylvestris) (N61,054422° E69,456725°).

Apothecia submerged in wood, spherical to deep cupulate, up to 300 mk wide, hymenium grayish, yellowish, smooth, outer surface rough, dark brown, radially splitted.
Excipulum from thick mass of cylindrical hyphae (not well distinguishable); asci bottle-shaped, bulged in the middle, extending in length when mature, clampless, near 60 x 15 mk, wall of ascus with amyloid reaction in upper part, pore inamyloid; spores ellipsoid, 3-segmented when mature, 12,7 (11,4-14) x 5,7 (5,3-6,1) mk; paraphyses filiform (1 mk thick), rare segmented at base.

I used the key in: Sherwood-Pike, M.A., 1987. The ostropalean fungi.

Hans-Otto Baral, 26-01-2013 20:15

Re : Odontotrema minus

I have here a very similar collection identified as O. minus, and the only thing I wondered was that it grew on bark instead on wood. Now I see that yours is on wood and your spores contain a lot of oil drops while mine are almost empty. In my experience with oil drops in spores the two can hardly be the same species. Regrettably, Sherwood's description does not mention the spore contents.

So I assume yours is the right O. minus.

Zotto

Nina Filippova, 26-01-2013 20:48

Re : Odontotrema minus

Thank you, - there is some difference in paraphyses as well (in your drowing they are segmented and thicker, in my specimen rare segmented and about 1 mk).?

Hans-Otto Baral, 26-01-2013 22:01

Re : Odontotrema minus

I am not sure about that. At least from your photos. I assume you used Melzer? My drawing shows living paraphyses and therefore the septa are better visible. The cells would shink when adding MLZ, and the septa less clear.

Sherwood's specimen has also quite many septa but what she draws is actually the dead plasma, not the cell wall, so the septa look thick.

Zotto

Nina Filippova, 28-01-2013 17:57

Re : Odontotrema minus

You are right, paraphyses are actually thicker and with septa when i used water or KOH, scarsely covered by a gel, with blunt tips (as it is in exiccata, not live specimen). There uploaded some better spore picture as well.

Hans-Otto Baral, 28-01-2013 18:01

Re : Odontotrema minus

Very good! Now I fear only a type study would tell us more. Or the species is variable.

Accès membres

Forum AscoFrance