a . Small seeds of 'Clemenules' obtained from pollination with irradiated pollen. b. Embryo present in seeds. c. Embryogenic calli originating from embryo culture. d. Cluster of embryos obtained from embryogenic calli. e. Shoots produced by embryos regenerated from embryogenic calli. f. Regenerated plant from direct germination of embryo without a callus phase. g, h. In vitro micrograft of haploid shoot.