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THE RELATIONSHIP OF THE BARK FORMATION WITH SEASONAL CHANGES IN POPULUS DAKANENSIS Growth and Characteristics of Cork from Two Types of Quercus variabilis in North Slopes Qinling Mountains Effects of Flower-Nipping on Morphology and Yield and the Formation of Wound Periderm of Tse-Pear The Study of Special Periderms in the Root of Gentiana macrophylla Pall The Anatomy of Secondary Phloem and Periderm of Four Host Tree Species of Laccifer lacca