Absence of Callose and Tetrad in the Microsporogenesis of Pandanus odoratissimus with Well-formed Pollen Exine

In the microsporocytes of Pandanus odoratissimus, cytokinesisis successive with centrifugal cleavage in both the meioticdivisions. The dyads move apart from each other after the firstdivision, and the microspores likewise after the second division,so that only monads are formed at the end of meiosis. Althoughno trace of callose wall is found at any stage around the microsporocyteor microspore, fertile, monocolpate pollen with well-developed,spinescent exine develops, and is shed at the two-celled stage. Pandanus odoratissimus, microsporogenesis, centrifugal cleavage, absence of callose, monad formation