八属木兰科植物木材导管分子的比较解剖

本文比较描述了我国木兰科木莲属、华盖木属，长蕊木兰属，拟单性木兰属，合果木属，观光木属，香木兰属和鹅掌楸属等8属22种植物次生质部的导管分子，这些导管分子的长度和宽度都有差异，木莲属的所有种中都有具梯状穿孔板的导管分子，但在少数种中偶然可见到单穿孔，在其它属中，也都有具梯状穿孔板的导管分子，仅在观光木属中偶见的单穿孔，木莲属大多数种均无螺纹加厚，仅桂南木莲一种除外，另外，除了合果木属和鹅掌楸无螺纹加厚外，其余均有此种加厚，各属的导管分子还存在其它一些差异。

COMPARATIVE ANATOMICAL STUDIES ON THE VESSEL ELEMENTS OF EIGHT GENERA IN MAGNOLIACEAE

This paper deals mainly with comparative studies on vessel elements of secondary xylem in Chinese Manglietia,Manglietiastrum,Alcimandra,Parakmeria,Paramichelia,Tsoongioden- dron,Aromadendron and Liriodendron.There are some differences between the genera in vessel element length and width.Manglietia species all have scalariform perforation plates, only a few also have simple perforations.The other genera have scalariform perforation pla- tes.only one (Tsoongiodendron odorum Chun) has simple perforations in addition.There are no spiral thickenings in Manglietia except for one speciesManglietia chingii Dandy(M.te- muipes Dandy)].Paramichelia and Liriodendron have no spiral thichenings,but they are pre- sent in the other genera.In addition,some other differences in vessel elements between these 8 genera are also discussed.