1. Plasmodesmata are generally present in the walls of living cells of higher Cryptogams and Phanerogams. 2. Plasmodesmata are of true protoplasmic nature and form connections between the protoplasts of neighbouring cells, thus establishing a correlated entity of interconnecting protoplasts instead of a community of separate cells. 3. The actual functions of the plasmodesmata have not been definitely established, but these structures may serve as channels for material transport and for perception and conduction of stimuli.