Microsporogenesis, development of male gametophyte in Michelia figo and their systematic significance A Cytological Study on the Cytology of Michelia figo (Magnoliaceae) Histochemical Observation of Polysaccharides and Lipids on the Developing Anthers of Michelia figo A New Variety of Michelia ‘Huahaoyueyuan’ Ultrastructural Observation of the Microsporogenesis and Pollen Development in Michelia figo