作 者 ：Xi Yi-Zhen
期 刊 ：植物分类学报 1986年 4期
关键词：
Keywords:Pollen morphology, Taxaceae, Taxonomy, China,
Abstract:
The present study deals with pollen morphology of 4 genera and l0 species
of Taxaceae in gymnosperms. Pollen grains of the family are spheroidal or subsphe-
roidal, 20.8μm in diameter and with laptoma or papilla in the distal face. Exine is
two-layered, with sexine equal to nexine in thickness, but sometimes the stratification is
indistinct. The surface is scabrous or slightly granular under LM. Coarse verrucae and
fine tuberculae on pollen surface are observed under SEM. From thin section, ende-
xine is shown to have lamellate structure, and ectexine is made of verrucate elements.
In Amentotaxus argotaenia, some pollen grains show remnant saccate.
According to pollen morphology, this family may be divided into two tribes: 1,
Pseudotaxeae (including Pseudotaxus only), and 2, Taxeae (including Taxus and Torre-
ya). Owirg to the special feature of pollen grains in Amentotaxus the present author
suggests that the genus be separated from Taxaceae and raised to the level of family,
Amentotaxaceae.