Spores from resistant sporangia of Blastocladiella emersonii produce populations consisting of three types of plants, designated as orange, ordinary colorless, and late colorless. By staining with the Nadi reagent, a different distribution pattern of cytoplasmic particles (gamma), was found in swarmers derived from each of these plants. The pattern in swarmers from an orange mutant of B. emersonii corresponded to that of the swarmers from orange plants of the wild type. These findings tend to corroborate an earlier postulation that the concentration of gamma controls the genesis of orange or colorless plants, or the presence or absence of carotene, and by analogy with related organisms, "maieness" and "femaleness.".