Meiosis in pollen mother cells was studied in twenty plants of Alyssum maritimum. The pollen mother cells were found to show active divisional stages in the afternoon between 3–30 P.M. and 4–30 P.M Out of acetocarmine, oceto-orcein, propionocar-mine and crystal-violet which were used in staining meiotic chromosomes, aceto-orcein gave best results. Although a few pollen mother cells at diakinesis showed nine bivalents and six univalents, majority of them showed twelve bivalents. Twelve chromosomes were clearly seen in the first metaphase plates. The distribution of chromosomes at anaphase I was regular, twelve chromosomes being clearly visible at either pole. Twelve chromosomes in each nucleus were also noticeable at metaphase II. The anaphase II was also regular with twelve chromosomes going to each of the four poles. The number of spores per pollen mother cell was four (normal tetrads). The wall formation was of the simultaneous type.
