Fig. 7
From: Revealing the diversity of amber source plants from the Early Cretaceous Crato Formation, Brazil
Individually prepared pollen grains from Araripestrobus resinosus gen. nov et sp. nov. under SEM. a–c 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. g–h 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