Image analysis on epidermal cells of leaves in medicinal plants of Swertia L. STUDY ON MORPHOGENESIS OF STUDY ON MORPHOGENESIS OF MULTI-TISSUE AND ORGANS IN THE TCL OF TOBACCO EPIDERMIS Sporophytic morphology characteristics comparison and water physiological indexes measurement of two pteridophytes in Asplenium Epidermal Characters of Rattan Stems and Their Taxonomic Implications Leaf Epidermal Cells: A Trap for Lipophilic Xenobiotics