URTICA MEMBRANACEA PEARL GLANDS .2. SOME ASPECTS OF NUCLEAR-METABOLISM

By cytological and microdensitometric methods some aspects of the nucl ear metabolism of the pearl glands of U. membranacea Poir. and of the glandular trichomes associated with them have been studied. The result s seem to agree with the previously made hypothesis that the pearl gla nds are in some way connected with water metabolism and that the assoc iated glandular trichomes are implicated in the regulation of the inte rrelation between the plant and some particular animals. The functiona l meaning of the association between pearl gland and glandular trichom e is not yet clear. Studies regarding this problem are in progress.