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Menno Boomsluiter

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Ascobolus on wood (Picea) = A. lignatilis
Riet van Oosten, 15-01-2021 22:07
Riet van Oosten
Hello,

Found by Adria Klumpers, The Netherlands, 19-12-2020 on Picea (wood).

Could this be Ascobolus foliicola or A. epimyces?

Ascus walls scarcely blue in Melzer's.

Spore sizes: Me 17.7 x 8.1 µm (N = 15)

Greetings, Riet
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Charles Aron, 16-01-2021 11:04
Charles Aron
Re : Ascobolus on wood (Picea)

Hi Riet,


Some years ago I collected an Ascobolous from a fallen, rotten trunk or branch of Picea. I remember that there was quite a dense colony. This I IDed as Ascobolus lignatilis from Ellis and Ellis and is the only lignicolous species in that reference. It does seem quite close to foliicola both macroscopically and microscopically but with a different habitat preference. Is epimyces a soil-dwelling species?


Best wishes,


Charles.


 

Michel Delpont, 16-01-2021 11:46
Michel Delpont
Re : Ascobolus on wood (Picea)
Hello !

Nice pictures ! Rather agree with Charles for A.lignatilis. In my opinion, A.epimyces has more pointed spores at the ends with a more dense ornamentation, and A.lignicola an on average larger spore width with a more reticulate ornamentation.


Michel.

Nicolas VAN VOOREN, 16-01-2021 11:47
Nicolas VAN VOOREN
Re : Ascobolus on wood (Picea)
Based on your data and pictures I would say this is A. lignatilis.
I have no experience of A. epimyces but based on Brummelen's description the latter has more fusoid ascospores with anastomosing ridges. This is not the case in the ascospores of your collection.
This is not a common species.
Riet van Oosten, 16-01-2021 12:23
Riet van Oosten
Re : Ascobolus on wood (Picea)
Thank you very much for your help Charles, Michel and Nicolas!

Hi Charles, Van Brummelen, pag. 130 (A. epimyces) says: "on rotten wood, on rotten leaves of trees and old paper".

Thank you for the compliments Michel! :-)
Charles Aron, 16-01-2021 16:47
Charles Aron
Re : Ascobolus on wood (Picea) = A. lignatilis

Hi again Riet,


Thanks for the reference-have just had a look and the fusoid spores seem characteristic of epimyces.


Charles.

Peter Püwert, 16-01-2021 22:42
Peter Püwert
Re : Ascobolus on wood (Picea) = A. lignatilis
Happy New Year everybody !

Yes, Ascobolus epimyces is a quite rare species. In our region we find Ascobolus lignatilis frequently on dung.

Regards Peter.
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Riet van Oosten, 17-01-2021 10:26
Riet van Oosten
Re : Ascobolus on wood (Picea) = A. lignatilis
Happy new year Peter! 
Thank you very much for the beautiful pictures! 
For me it's the first species Ascobolus I see, so it's very nice to compare!