ONTOGENESE STAMINALE : PHASE 1
Ar, archesporial; E, epidermis; En, endothecium; L1, L2, L3, Layer 1, 2, 3; ML, middle layer; Ms, microsporocytes; Msp, microspore; PG, pollen grain; PPC,
primary parietal cell; PSC, primary sporogenous cell; Sm, septum; SPC, secondary parietal cell; St, stomium; T, tapetum; Tds, tetrads.