Cryptocarya fossil flower from Miocene Zhangpu amber, PB21525. A. Overview of the flower inclusion, taken under the light microscope; B–D. Virtual 3D reconstruction from segmented SRµCT data; B. Overall flower; C. Cross section; D. Longitudinal section; E–G SRµCT cross-sections, indicated in D and arranged from top to bottom; E. Bilocular anthers with two valves and laterally fused pollen sacs (septa indicated by white arrowheads); F. Style, staminodes, glands, and the filaments of the fertile stamens adnate to a tepal lobe; G. Short staminal tube resulting from the fusion of the third whorl of stamens with the whorl of staminodes. Perianth – grey; Stamens of the first whorl – red; Stamens of the second whorl – orange; Stamens of the third whorl – beige; Anther valves – white; Staminal glands – pink; Staminodes – yellow; Gynoecium – purple; Ovule – blue. Scale bars: 0.5 mm (A–D); 0.4 mm (E–F); 0.3 mm (G).