This pollen type occurs frequent in the gut content of Bumblebees collected in Belgium. It might be from an exotic plant occurring in gardens however.
For more images, see also:
https://globalpollenproject.org/Grain/Identify/25
Dear Koen,
Based on the interconnecting arci and the pores, the pollen no. 3 on the row is Alnipollenites verus (Alder). The no. 2 may also be. although it looks tricolporate..
All the best.
Obianuju P. Umeji
Dear Obianuju,
what you see on pollen no. 3 are colpi, no arci. In fact, all the images that I posted are from the same pollen type that is mostly 3-colporoidatae but sometimes 4-colporoidatae.
All the best,
Koen
Dear Koen,
Most probably it is a Rosaceae pollen and could be pollen of Crataegus or Prunus. I have already prepared modern pollen samples from Rosaceac- Creataegus collected from Zagros Mountains, Iran and its pollen looks like what you have posted here. Crataegus tree is a favorable source of nectar for Bumblebees.
Best
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