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02-07-2025 18:45

Elisabeth Stöckli

Bonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

02-07-2025 09:32

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello, bonjour.Here is the paper I'm searching for

30-06-2025 16:56

Lydia Koelmans

Please can anyone tell me the species name of the

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

30-06-2025 12:09

Edvin Johannesen Edvin Johannesen

This tiny, rather "rough" erumpent asco was found

30-06-2025 06:57

Ethan Crenson

Hi all, Another find by a friend yesterday in Bro

30-06-2025 19:05

ALAIN BOUVIER

Bonjour à toutes et à tousJe cherche à lire l'a

30-06-2025 14:45

Götz Palfner Götz Palfner

This is a quite common species on Nothofagus wood

25-06-2025 16:56

Philippe PELLICIER

Bonjour, pensez-vous que S. ceijpii soit le nom co

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Ascobolus puzzle
Chris Yeates, 03-12-2021 15:29
Chris YeatesBonjour tous

An Ascobolus sp. has appeared in some quantity on dung of Canada Goose, Branta canadensis.

The apothecia are whitish, globose and very small (0.25-0.3mm) and would presumably be placed in section Dasyobolus. Asci are 8-spored; the ascospores measure 29-31.1 x 15.5-17.6µm. It is the ornamentation of the ascospores which has me confused. The pigmented epispore is not smooth, or warted or with a pattern of elongated cracks, instead the surface of the spores is covered with numerous, small irregular pits (De: "Gruben" / Fr. "fosses") as can be seen in these preliminary images. The ornamentation is not total in many spores and there are are paler areas; on seeing this at lower magnifications I wondered about A. degluptus, but all the images of that I have seen show a warted ornamentation. There are occasional irregular cracks on some of the spores - these can be seen in the images here.

I know A. stictoideus well and it is not that - I also place here an image of that species using the same microscopy to show the difference.

I cannot find any Ascobolus species which match this find - any thoughts would be very welcome. More images will follow.

Cordialement

Chris
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Michel Delpont, 03-12-2021 17:14
Michel Delpont
Re : Ascobolus puzzle
Good evening Chris!

Indeed your spore measurements are a bit large for stictoideus, but otherwise I find that they look good for this species. Degluptus is different for ornamentation and does not match in my opinion.

Michel.


Chris Yeates, 04-12-2021 16:13
Chris Yeates
Re : Ascobolus puzzle
Many thanks Michel

I agree about the measurements being reasonable for A. stictoideus and that this is clearly not A. degluptus. But the spore ornamentation seems very different from both - perhaps you have seen similar? Also the ascus wall did not turn blue with IKI (Baralsche Löhsung).

I shall make some more preparations.

Chris