This pollen belongs to family Astereceae, subfamily cichorioideae.

The determination by Reza is correct: The pollen grains belong to a species of the tribe Lactuceae (=Cichorieae), family Asteraceae! Regards Karl

Dear Reza and Karl,

Yes, all right, and it confirms the available data on the trophic relations of these bees (all from the genus Dasypoda, Melittidae).

Thank you for a quick and correct answer, as I myself would have spent a lot of time searching for such data (and time, as always, is not enough).

With best wishes,

Vladimir

Aetheorhiza ssp.?¿