THE MORPHORLOGY, STRUCTURE AND DEVELOPMENT OF WINTER BUD IN BRASENIA SCHREBERI GMEL. A Study on the Damage of Hg^ Pollutant to the Ultrastructural Changes of Young Leaves of Brasenia schreberi Winter Bud STUDIES ON THE DEVELOPMENT AND ULTRASTRUCTURE OF THE GLANDULAR HAIRS IN BRASENIA SCHREBERI GMEL AN ANATOMICAL AND PHYSIOLOGICAL STUDY ON THE LEAVES OF WINTER BUDS OF BRASENIA SCHREBERI GMEL. Study on the cold hardiness physiology of winter buds of Brasenia schreberi Gmel. Peltate Leaf Development in Brasenta schreberi Gruel Study onthe relations between the toxic effects of chromium-vion Brasenia schreberi Gmel.winter bud leaves andthe variations of the protective enzyme system