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28-07-2011 18:31

Alex Akulov Alex Akulov

Dear FriendsToday I made the pdf file of Velenovsk

26-03-2024 17:14

Juuso Äikäs

These little black ascos were growing on a dead, d

27-03-2024 22:53

Charles Aron Charles Aron

Hi All,Recently I came across these minute, setose

25-03-2024 13:41

B Shelbourne B Shelbourne

• Hyaloscyphaceae (no VBs), Hyaloscypha: Macro a

25-03-2024 21:27

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, March 2024

26-03-2024 14:37

DAVID MARCOS DAVID MARCOS

Spores (telles qu'elles apparaissent à l'intérie

24-03-2024 08:27

Thierry Blondelle Thierry Blondelle

HiOn Hedera helix fallen branchEcological habitat:

26-03-2024 11:06

michel bertrand

Bonjour, Malgré de nombreuses recherches, je n'a

25-03-2024 14:08

Ursula Kozik

Bonjour et bonne journée, On m'a envoyé une tro

25-03-2024 03:56

B Shelbourne B Shelbourne

• Scuttelinia: Macro and habitat.• S. scutella

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Trichopeziza (?) on Ulmus
Edvin Johannesen, 05-01-2019 14:43
Edvin JohannesenThis 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?
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Hans-Otto Baral, 05-01-2019 15:12
Hans-Otto Baral
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
Edvin Johannesen, 05-01-2019 15:25
Edvin Johannesen
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
Edvin Johannesen
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 :-)
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Hans-Otto Baral, 05-01-2019 17:42
Hans-Otto Baral
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.