Fig. 3.

Semi-diagrammatic representation of anther opening in Allium triquetrum viewed in cross-section derived from stereomicroscopic and microscopic observations. (A) Anther walls lining the broken stomium, adhered to each other and curved inward at this site (arrows) while the septum shrinks (asterisks). Stage equivalent to that shown in Fig. 2E. (B) Anther opening; the walls split and move apart from each other showing the already broken stomium (arrows). Stage equivalent to those shown in Fig. 2A and F. (C) After the opening, the walls gradually bend outward while shrinking laterally in the directions of the arrows. (D) The ventral walls extend to lie parallel to each other, the dorsal walls bend outward to form a concave surface (arrows). The pollen, now dehydrated and coated in pollenkitt (not represented), spreads in a disorderly manner over the walls. CT, Connective tissue.