粤北晚三迭世一种新的木化石

A New Permineralized Wood of Later Triassic from Northern Guangdong Province

本文描述了采自粤北晚三迭世艮口群下部的一种木化石,其解剖特征与原始叶枝杉型木属Protophyllocladoxylon Krausel相符,因此归入该属。但与该属已有各种均不相同,建议定为一新种:斯氏原始叶枝杉型木P.szei sp.nov,种名用以纪念中国著名古植物学家斯行健先生。

A kind of perminralized woods from Gengkou Group, Later Triassic of Nor- thern Guangdong province are described in this paper. The woods are similar to Protophyllocladoxylon Krdusel in anatomy, but the present specimen is different from all known species of Protophllocladoxlon Krdusel. So the present speciemen is named as P. szei wang sp. nov.. Protophyllocladoxylon szei Wang S. J. sp. nov.: Transverse section: Growth rings are indistinct. The tracheids are round, hexagon and nearly isodiameter. 40～50 in diameter. The wall is thin. Radial section: Pits on the radial walls of the tracheids are usually unise- riate, circular to subcircular, contiguous or sometimes seperate. The pit pore is round, elliptical or oblique and oval. The cross-field pits are simple, broad, large, usually one (rarely two) in number, oblique and oval or elliptical. Tangential section: The xylem rays are uniseriate and 1～10 cells (usually 1～4 cells) high. There are no pits on the tangential walls of the tracheids.