Fig. 6. Scanning electron microscopy and histology of developing male reproductive organs. (A) Developing wild-type male spikelet showing the upper (right) and lower floret with stamens (st), a palea (p) and lemma (l). (B) A double mutant male spikelet showing a broken palea (p), abnormal stamens (abst) in the upper floret, extra vegetative organs (*) in both florets, and a small ectopic floret (ef). (C) Longitudinal section of a wild-type male spikelet showing glumes (gl), lemma (l), and two normal stamens (st). (D) A double mutant spikelet showing glume, lemma and an abnormal stamen with a small locule. (E) An indeterminate double mutant spikelet. (F) Whole-mount image of a double mutant floret with two abnormal stamens and overproliferating vegetative organs. (G) Stamens from a double mutant floret showing twisting and vegetative outgrowths (*). (H) A double mutant floret with overproliferating vegetative organs and no stamens.