Abstract
Detailed microsporogenesis of hexaploid Morus serrata has been studied. This is the first record of natural hexaploidy (2n=6x=84) in the species. Meiosis has been found regular with high frequency of bivalents. The frequency of hexa-, penta-, tetra- and trivalents is considerably less suggesting its allopolyploid nature. Diploid like behaviour of this species with high frequency of bivalents, regular meiosis and high pollen stainability are discussed in relation to its evolution.
