H2O2-CH2COOH maceration——a simple and perfect method for leaf epidermis Methods of maceration and microscopical analysis on cuticle APPLICATION OF ODO FREEZE CRACKING METHOD FOR SPECIMEN PREPARATION OF POLLEN GRAINS UNDER SCANNING ELECTRON MICROSCOPY The Optimization of Experimental Conditions of NaClO Maceration for Brassica oleracea var. capitata Leaf Nervation Observation COMPARATIVE STUDIES ON ISOLATED EMBRYO SACS IN FOUR SPECIES OF CAMPANULACEAE