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Unknown spore from Baltic amber
Hans Halbwachs, 16-05-2020 12:30
Dear all, I have found quite a few spores in Baltic amber. One very distinctive spore puzzles me. 
Its size is 6x15µm. I assume an ascospore, though neither in the Nordic Macromycetes (Ascomycetes) nor in the Hanlin (Illustrated Genera of Ascomycetes) I could find anything.

Can anbody help? Thank you, Hans
  • message #63238
Nicolas Schwab, 16-05-2020 16:17
Re : Unknown spore from Baltic amber
It looks like the spores of the genus Gautieria, which are basidiomycetes.
Hans Halbwachs, 16-05-2020 16:35
Re : Unknown spore from Baltic amber
You are a genius, Nicolas. I have never come across this genus before.

Many thanks, Hans

PS: Please givr me your location/credentials for the acknowledgements in my article
Nicolas Schwab, 17-05-2020 00:11
Re : Unknown spore from Baltic amber
Thank you, but that's only because I came across this genus a few times.

I think you can see all my info on my profile. E-mail me if you need anything.
Hans Halbwachs, 17-05-2020 09:11
Re : Unknown spore from Baltic amber
Thank you Nicolas, please give me the location in Switzerland, Hans
Nicolas Schwab, 19-05-2020 11:08
Re : Unknown spore from Baltic amber
I am from Renan, canton of Bern.
Ludovic Le Renard, 29-05-2020 02:32
Ludovic Le Renard
Re : Unknown spore from Baltic amber
Dear Hans,

You may want to consider the fossil genus Striadisporites. See Kalgutkar & Jansonius (2000).

The striking features of your fossil spore comprise the ridges, the pinched area at the base, and what appears like a pore facing the pinched area. The pinched base is reminiscent of hilar appendix but I am not sure that is how Nicolas interpreted this spore.

Gautieria species don't have much hilar appendix as depicted by Zeller and Dodge (1918) and a blunt bases instead, facing a rather round outline at the opposit side, and devoid of germ pore.

I don't know if more recently described species of this genus have pinched basidiospore apex but I think other genera in Boletales may also have ridges.

The overall spore shape is also reminiscent of Ascomycota in Sordariales, but I don't know anything ridged in this group.