Odontotrema minus - Forum ASCOFrance

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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.

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