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Fig. 7 | BMC Evolutionary Biology

Fig. 7

From: Revealing the diversity of amber source plants from the Early Cretaceous Crato Formation, Brazil

Fig. 7

Individually prepared pollen grains from Araripestrobus resinosus gen. nov et sp. nov. under SEM. ac Pollen with view of the sulcus. d Detail of c showing smooth perforate sulcus membrane and rounded end. e Pollen grain folded along sulcus showing one pseudosulcus and the perforate microrugulate surface. f Detail of pseudosulcus area near rounder end from grain in e. gh Pollen orientated on the sulcus with the two pseudosulci visible and variable surface texture. i Detail of h showing the microrugulate surface with both microfossulae and perforations

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