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19-01-2022 20:31

William de Jong

Hi,I found Hydropisphaera erubescens, I think, on

22-01-2022 13:31

Niek Schrier

hi everyone, I found this nectria like fungi grow

24-02-2021 11:51

William de Jong

Hi,A few days ago I found Helminthosporium velutin

24-01-2022 17:37

hannie wijers

Hello again, I'dd like some help if possible. At

23-01-2022 23:53

BERNARD CLESSE BERNARD CLESSE

Bonsoir à toutes et tous,J'ai trouvé récemment

24-01-2022 00:52

Marcel Heyligen Marcel Heyligen

This has already been found twice in 2016 on Vacci

23-01-2022 18:44

Josep Torres Josep Torres

Hola.Unos muy diminutos apotecios de color negro d

23-01-2022 00:46

Valencia Lopez Francisco Javier

Hola a todosApotecios recolectados en las vainas c

22-12-2021 17:07

Andgelo Mombert Andgelo Mombert

Bonsoir, Sur branche morte cortiquée de Quercus

22-01-2022 22:35

Joop van der Lee Joop van der Lee

Found on rabbit pellets.When investigating a Schiz

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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