Abstract
InHeuchera micrantha Dougl. the tapetum is secretory and its behaviour variable. The study of tapetum with reference to development and behaviour of meiocytes suggests a correlation between them. In a few sporangia meiocytes follow more than one way of development indicating that their behaviour is not totally controlled by the tapetum. Inner tangential walls of tapetal cells show thickening composed of sporopollenin-like substance. The thickening probably prevents transport of nutrients from tapetum to meiocytes resulting in hypertrophied tapetum and degeneration of meiocytes.
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