FIGURE 4 in Pollen micromorphology and ultrastructure on four genera from Asphodelaceae and their taxonomical implication

FIGURE 4. Transmission electron microscopic micrographs from Aloe vera (A. section of the whole pollen grain, B. pollen grain wall, and C. the pollen grain wall in the sulcus margin region) and Eremurus spectabilis (D. section of the whole pollen grain, E. pollen grain wall, F. the pollen grain wall in the sulcus margin region). F (Foot layer), C (Columellae), T (Tectum), E (Ectexine), In (Intine), and Io (Intine layer in the sulcus region). Scale bars—4 μm (A), 10 μm (D), 1 μm (E and F), and 0.5 μm (B and C).