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Cytological and morphogenetical studies were conducted on the tissues ob tained in vitro, from the mature embryo and endosperm of three mistletoes: Dendro phthoe falcata, Taxillus cuneatus and T. vestitus (Loranthaceae). Differentiation of shoot buds and haustoria was observed during repeated subcultures of the embryo and endosperm tissues (on a similar medium). Cytological preparations of the embryonal and endosperm callus, and organs differntiated therefrom, showed the 812 B. M. Johri and K. K. Nag Cytologia 39 diploid (2n=18) and triploid number (3n=27) of chromosomes, respectively. A cytological study of D. falcata (in vivo) indicated regular meiosis (n=9) during micro -sporogenesis. The developing embryo, endosperm, and fruit wall tissues exhibited constant chromosome numbers: 18, 27 and 18, respectively. The morphology as well as anatomy of diploid and triploid organs, differentiated in vitro, was more or less comparable. Acknowledgements Grateful thanks are acknowledged to Professor A. K. Sharma (Calcutta) and our colleagues Dr. P. S. Srivastava and Mr. A. P. Raste for checking this manu script and valuable suggestions.

Cytology and Morphogenesis of Embryo and Endosperm Tissues of <i>Dendrophthoe</i> and <i>Taxillus</i>