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Trichopeziza (?) on Ulmus
Edvin Johannesen,
05-01-2019 14:43
This one is collected on dead wood of Ulmus glabra. Spores (in Congo Red in water) measure 22-27 x 5-6 microns. No croziers (?). Spores aseptate. Hairs very bright yellow. They seem more twisted than straight (in the microscope) and not very heavily incrusted. Is this a Trichopeziza and if so, is there a species which fits?
Hans-Otto Baral,
05-01-2019 15:12
Re : Trichopeziza (?) on Ulmus
I assume the wood was lying in wet mud, right?
The hairs must be rather narrow, about 50-75 µm long, tapering. The apical ing must react blue in Lugol (finally dirty red when concentrated). Absent croziers is correct.
The apos are much smaller than 1 mm?
And look: the paraphyses are quite narrow an filiform, very unlke Trichopeziza. Also I think the ectal excipulum is not of globulosa.
Amicodisca virella (= brdensis).
Zotto
The hairs must be rather narrow, about 50-75 µm long, tapering. The apical ing must react blue in Lugol (finally dirty red when concentrated). Absent croziers is correct.
The apos are much smaller than 1 mm?
And look: the paraphyses are quite narrow an filiform, very unlke Trichopeziza. Also I think the ectal excipulum is not of globulosa.
Amicodisca virella (= brdensis).
Zotto
Edvin Johannesen,
05-01-2019 15:25
Re : Trichopeziza (?) on Ulmus
I have no information about how the wood was lying. I will check if the finder remembers. Yes, the apothecia are very small.
I will check the Lugol reaction and the ectal excipulum.
Thanks a lot!
Eddi
Edvin Johannesen,
05-01-2019 15:47
Re : Trichopeziza (?) on Ulmus
The ascus apical ring is dark blue in Baral's medum. Excipulum is more towards textura prismatica? I do not see globular cells.
I take it that this is Amicodisca virella, then. First record from Norway :-)
Hans-Otto Baral,
05-01-2019 17:42
Re : Trichopeziza (?) on Ulmus
Looks almost a bit reddish, this which is typical.
Well I see isodiametric cells but a good idea is only obtained in a section.
Well I see isodiametric cells but a good idea is only obtained in a section.