Study on the Relationship between Embryo Genesis and Isozymes Divergence in Doritis pulcherrima Lindl. Seedling Cultivation of Doritis pulcherrima Lindl. with Mycorrhizal Fungi Ultrastructural Observations on Megasporogenesis in Doritis pulcherrima (Orchidaceae) Isolation of Zygotes and Proembryos in Doritis pulcherrima Seedling Cultivation of Doritis pulcherrima Lindl. with Mycorrhizal Fungi THE STUDIES OF THE FEMALE GAMETOPHYTE DEVELOPMENT AND THE EMBRYOGENESIS IN DORITIS PULCHERRIMA LINDL. In Vitro Megagametophyte Development via Unfertilized Ovule Culture in Doritis pulcherrima Isolation of Sperm Cells in Doritis pulcherrima