That pollen which is smaller than other grains and has a prolate shape is pollen of Onosma from family Boraginaceae.
I also agree with Onosma and Quercus and i think the big reticulate pollen grain might be a Lamiaceae pollen grain (6-colpate, oblate, medium-sized), but it looks a bit deformed.
The pollen grain assumed to be Lamiaceae is certainly deformed: it is egg-shaped or prolate. The angle between the two visible colpi seems to be less than one-sixth of an entire circle, suggesting that more than 6 colpi might be present. E.g. Mentha can have up to 8 colpi on its prolate grains, but the grains are not reticulate. The pollen grain in front looks like a fenestrate type; maybe Taraxacum or a related genus. Dear Vladimir: Does al the identifications make any sense? What is the geographic origin of the material?
The grain at the very front can be Cichoriaceae (Asteraceae - Cichorioideae)... ?
Dear Ulrich and Leo,
This third pollen grain (the big reticulate), apparently, of Helianthemum (Cistaceae) because this bee was collected from this plant that has such pollen.
This material was collected in Spain near Madrid (El Espinar).
The pollen of Helianthemum nummularium is usually described as small, rugulate, and tricolporate (see, e.g., paldat database). I have my doubts to conclude for that identification.
https://www.paldat.org/pub/Helianthemum_nummularium/109894
Dear all,
I agree with the other identifications but I don't think the reticulate pollen is Helianthemum, which is reticulated-striated…It could be a Lamiaceae as other people suggested.
Cheers
Dear Vladimir,
The first one is (half one I see) Asteraceae (Taraxacum spp.), Second one is Quercus, Third one is Boraginaceae (Echium spp.) Fourt one is Lamiaceae... I am studied pallynology in Turkey..I advise u also look at the place where u take the sample...which plants grow there...sincerelly...
Assoc. Prof. Aslı ÖZKÖK
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