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26-10-2020 09:58

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hi.Here is the tiny white discomycete (~0.1 mm Ø)

25-10-2020 17:53

Guy Buddy

Good day,This fungus was fruiting abundantly from

26-10-2020 07:48

Blasco Rafael Blasco Rafael

Hola, esta muestra estaba sobre tallos de Angelica

25-10-2020 12:35

Juuso Äikäs

These were growing on a low branch of a deciduous

25-10-2020 18:32

Mirek Gryc

HelloSomeone help?Mirek

23-10-2020 21:50

Dirk Baert

Hello,I fund this Helicoon spec. on rot wood.anyon

24-10-2020 14:28

Castillo Joseba Castillo Joseba

De esta mañana recolectada  en acicullas de abet

23-10-2020 12:57

Marek Wolkowycki Marek Wolkowycki

Hello Bia?owie?a Primeval Forest on live shoots o

23-10-2020 12:02

Stephen Mifsud Stephen Mifsud

Hi, I found small white-cream colonies on decaying

23-10-2020 19:45

Angel Pintos Angel Pintos

Hello, anybody have:?Kohlmeyer, J. and Kohlmeyer,

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Puzzling pyrenomycete
Chris Yeates, 17-10-2020 20:29
Chris Yeates
Bonsoir tous

I recently collected, on a decorticated Quercus branch, numerous tiny black ascomata. They are up to 120µm in diameter and very flattened - i.e. not globose. While appearing smooth under the microscope there are short stout setae (less than 20µm long.).

The spores are uniseriate in the lower part of the asci, but clustered/biseriate towards the apex. In the living state they are mostly biguttulate and measure 6.4-8 x 2.7-3.1µm; in strong IKI the VBs break down and the older spores show a (true?) septum and the fact that they are clearly thick-walled.

Again in IKI the asci do not show a consistent apical apparatus - there is no blueing, in some cases what looks like a Diaporthales-type apex can be seen (see image) but nothing is visible in living material.

I can't even start to place these in an order and would welcome any suggestions.

Amitiés, Chris
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Paul Cannon, 20-10-2020 18:34
Re : Puzzling pyrenomycete
Hi Chris

As no-one has suggested a name for this, I'll venture a suggestion.

It's difficult to see any details of the ascomata from your images (they need to be dry...) but I would look in and around Nitschkia. The genus Acanthonitschkea differs from Nitschkia [both genus spellings are correct, by the way] by the presence of spines on the ascomata/subiculum. However, yours are very small and inconspicuous and it could therefore be a short-spined species of Nitschkia with these being overlooked by previous authors. These things happen...

N. confertula might fit your collection, possibly, but there are other options. See Nannfeldt, Stray studies in the Coronophorales (Svensk Bot Tidskr. 69: 289, 1975), also Huhndorf et al. (Mycol. Res. 108: 1834, 2004) - I can send you if needed.

Good luck!

Paul
Chris Yeates, 20-10-2020 20:55
Chris Yeates
Re : Puzzling pyrenomycete
Thanks for the comments Paul.

Both the spores, and their arrangement in the asci are, I agree, similar to that one sees in Nitschkia and its allies. However, something I didn't mention in my original post was that the perithecia were thin-walled (no risk to cover-slips!), unlike Nitschkia, and, although black were slightly transparent. I know several of the species in that genus - including N. confertula (see attached). Also the perithecia were at most half the minimum diameter cited for all the likely Nitschkiae. The material is now dried and I shall have another look at it in due course.

Cheers, Chris
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