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25-11-2020 10:03

Garcia Susana

Hola, Recogí estos ascomas en un trozo de madera

24-11-2020 20:29

Riet van Oosten Riet van Oosten

Hello, Found by Gert Kremer, Nov. 2020, The Nethe

20-11-2020 11:30

Enrique Rubio Enrique Rubio

Does anyone have a pdf on this fungus?Sphaeronaeme

24-11-2020 20:23

William Slosse William Slosse

Hello all,could this be Cyathicula pallida?J+With

23-11-2020 17:16

Edvin Johannesen Edvin Johannesen

This very small (ca. 1 mm when disck is open), bea

24-11-2020 16:16

Thomas Læssøe

sulphur, woolly covering a la Cercophora sulphurea

24-11-2020 14:46

Thomas Læssøe

see: https://svampe.databasen.org/observations/101

24-11-2020 08:53

Garcia Susana

Hola, Recolectada en una rama de planifolio indet

23-11-2020 15:11

Edvin Johannesen Edvin Johannesen

Dear all, This one was sent to me as exciccate. O

23-11-2020 17:39

Charles Aron Charles Aron

Hi All, I found this yellow Discomycete on dung,

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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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