J Integr Plant Biol. ›› 1990, Vol. 32 ›› Issue (3): -.

• Research Articles •    

Studies on the Structural Types of Bordered Pits of Gymnospermous Woods in China

Zhou Yin, Jiang Xiao-mei and Zhang Li-fei   

Abstract: The structural types of bordered pits are the important characteristics of wood ultrastruc ture in gymnospermous woods have a certain value for the classification of wood. This study was based on the fine structures of bordered pits of 4 classes, 8 orders, 11 families, 42 genera and 100 species in gymnospermous woods of China, in which the authors suggested that bor dered pits could be classified into 8 different types: 1. Cycas-type, 2. Araucaria-type A, 3. Araucaria-type B, 4. Pinus-type A, 5. Pinus-type B, 6. Taxodium-type A, 7. Taxodium-type B, 8. Gnetum-type. In type A, the warty layer is absent or rare in pit chamber and in type B, the warty layer is present. In this paper, the variation in phylogeny of the pit membrane in bordered pits is also discussed.

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