Cytoembryological Studies on Polyembryonic Line SB-1 of Oryza sativa: Apogamy of Synergids Ultrastructural Observations on Parthenogenesis and Antipodal Apogamy of Allium tuberosum Roxb Chromosome numbers of four genera in the Dryopteridaceae EMBRYO SAC DEVELOPMENT AND EMBRYOGENY IN ALLIUM TUBEROSUM ON THE STABILITY OF SYNERGID APOGAMY IN RICE OVARY CULTURE AND ITS DEVELOPMENTAL CONDITIONS Further Embryological Studies on the in Vitro Apogamy in Oryza saliva L. Gametophytic Development and Apogamy of the Fern Onychium siliculosum(Desv.) C. Chr. Development and Apogamy of the Gametophyte of the Fern Pteris fauriei Gametophyte Development and Apogamy of the Fern Cheilosoria chusana