Text-fig. 21. Scanning electron microscope (SEM) images of stamens (a–c) with in situ trichotomocolpate Asteropollis type pollen (d– h); Torres Vedras locality, Portugal. a) Fragmentary tetrasporangiate stamen; b) Group of tetrasporangiate stamens; c) Single pollen sac from stamen; d, f) Distal view of pollen grains showing trichotomocolpate aperture; e, g) Pollen wall showing dense reticulum with faint supratectal ornamentation; h) Detail of pollen wall showing numerous long columellae. Specimens, TV44-S105012 (a, d), TV44-105015 (b, e), TV44-S136763 (c, f, g), TV44- S136669 (h). Scale bars 300 Μm (a–c), 6 Μm (d, f), 1.5 Μm (e, g, h). in The Early Cretaceous Mesofossil Flora Of Torres Vedras (Ne Of Forte Da Forca), Portugal: A Palaeofloristic Analysis Of An Early Angiosperm Community