Text-fig. 4. Synchrotron radiation X-ray tomographic microscopy (SRXTM) images of Kvacekispermum rugusum gen. et sp. nov. from the Early Cretaceous Vale de Água locality, Portugal (Holotype, S174951, Vale de Água sample 141). a–f) Longitudinal (a, b, c, e, f) and transverse (d) orthoslices through seed showing slightly raised stigma (arrow head) chalaza (asterisk) and endotesta (oi-en) surrounding endosperm with embryo cavity (arrow); details of endotesta (c, f) show clusters of crystals in grooves of the endotesta (oi-en) and cells of exotegmen (ii-ex). Scale bars = 500 μm (a, d); 200 μm (b, e); 250 μm (f); 100 μm (c). in Rightcania And Kvacekispermum: Early Cretaceous Seeds From Eastern North America And Portugal Provide Further Evidence Of The Early Chloranthoid Diversification