Abstract
Well‐preserved polliniferous flower buds from the Upper Miocene Inden Beds (Hambach lignite, Lower Rhenish Basin, Germany) were studied by scanning electron and transmission electron microscopy techniques. The Craigia bronnii flower buds are in many respects very similar to those of extant Tilioideae (Malvaceae). The in situ pollen strongly resembles fossil Craigia and recent Tilia pollen, respectively. Especially features of the endexine and the foot layer in the apertural areas and the idiomatic reticulum, including the peculiar mode of branching columellae, are highly similar. Amorphous, highly electron‐dense substances (pollenkitt) and orbicules, which are both likewise highly similar to those of recent Tilia, are present between and on the pollen grains of the flower buds. There is evidence from staining and sectioning behavior of this amorphous substance that it in fact represents pollenkitt.
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