Anatomical Studies on Secondary Phloem of Euonymus bungeanus Comparative Anatomy of Secondary Phloem in Celastraceae Ultrastructure of Sieve Elements in Secondary Phloem of Dalbegia odorifera During Leaf-Bearing and Leaf-Absent Period THE ANATOMY OF SECONDARY PHLOEM IN SCIADOPITYS VERTICILLATA (THNUB.) SIEB. ET ZUCC. BARK STRUCTURE AND SEASONAL VARIATIONS OF SECONDARY PHLOEM DEVELOPMENT IN LIGUSTRUM LUCIDUM AND FRAXINUS CHINENSIS Anatomy of the Secondary Phloem and the Crystalliferous Phloem Fibers in the Stem of Torreya grandis Seasonal Variations of Secondary Phloem Development in Pterocarya Stenoptera and Its Relation to Feeding of Kerria yunnanensis Anatomical Studies on Secondary Xylem and Secondary Phloem of Dipentodon sinicus Anatomy of Secondary Phloem of Glyptostrobus in Relation to Its Systematic Position COMPARATIVE ANATOMY OF THE SECONDARY PHLOEM OF TAXACEAE Comparative Anatomy of the Secondary Phloem of the Stem in Cephalotaxus Periodicity of Cambium Activity and Seasonal Changes of the Secondary Phloem in Two Species of Dalbergia Effects of Doubled CO2 Concentration on Structure of Vascular Tissues of Quercus liaotungensis