Wood anatomy of 6 species in 4 genera of Lauraceae from China

摘要

In this paper, wood structure of 3 species in Alseodaphne and every one species in Syndiclis, Dehaasia and Nothaphoebe in China were studied comparatively. The main features are as follows: These 6 species all belong to diffuse porous wood; growth rings in D. hainanensis and S. lotungensis are indistinct; average tangential diameter of vessels in S. lotungensis are more than 190μm. In others it ranges 110- 150μm; vessel frequency only in A. hainanensis is more than 25/ mm~2. In others ranges 6-12/ mm~2. Average length of vessel elements of S. lotungensis are less than 0.4mm. But in other species it is 0.45-0.5mm. Difference in obliqueness of end walls are not significant, 50 ° -55 ° is common. Perforation plates are predominantly simple. Scalariform exists in N. cavaleriei, D. hainanensis and 3 species of Alseodaphne. Intervascular pitting is alternate and sometimes scalariform in A. hainanensis. Septate fibres are abundant in 3 species of Alseodaphne and N. cavaleriei. But they are absent in D. hainanensis and S. lotungensis. Parenchyma is abundant, especially in D. hainanensis vasicentric bandle with a few layer cells has been found. Crystal also was observed in 3 species of Alseodaphne. Heterocellular ray belongs to I and II in S. lotungensis, Ⅱ in D. hainanensis and m in 3 species of Alseodaphne and N. cavaleriei, Uniseriate rays are abundant in S. lotungensis, multiseriate rays are in 6 species. They are all 2-3 cells wide; 4 cells wide was found occasionall in N. cavaleriei; In S. lotungensis they are 1-4 marginal rows of upright and/ or square cells but only 1-2 in D. hainanensis. They are 5-7 rays/ mm in 6 species; oil and mucilage cells are common in both of axial parenchyma and ray tissues.