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20-01-2022 13:25

Castillo Joseba Castillo Joseba

Recolec tado en ramas de sauce semienterradasMe ma

16-01-2022 00:16

Rubén Martínez-Gil Rubén Martínez-Gil

Hola a todos.Subo unas fotos de un Ascobolus que h

13-01-2022 12:46

Malcolm  Greaves Malcolm Greaves

I have followed the discussions on the Geoglossum

19-01-2022 20:31

William de Jong

Hi,I found Hydropisphaera erubescens, I think, on

19-01-2022 10:25

Enrique Rubio Enrique Rubio

Hi ForumThe ascomata of this fungus grew on cortic

19-01-2022 02:24

Zuidland Peter

Hello all,I have found this erumpant only on Olear

19-01-2022 02:21

Zuidland Peter

Hello all,I have found this erumpant only on Olear

27-01-2019 00:41

Rubén Martínez-Gil Rubén Martínez-Gil

Hola a todos. Subo unas fotos de un asco que hemo

16-01-2022 15:10

William de Jong

Hi everyone,Found on a cone of Picea abies by Fran

16-01-2022 21:25

Robin Isaksson Robin Isaksson

Spores 10-15 x 1,8-2,3um Found on apel twig today

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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.


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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.


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.