作 者 ：ZHENG Zhong-Hua, WANG Ping-Li, PU Fa-Ding
期 刊 ：植物分类学报 1999年 3期
Keywords:Nothofagus,
Abstract:
The genus Nothofagus is mainly distributed in South America and New Zealand.
The present paper describes its pollen exine ultrastructure and compares the exine ultrastruc-
ture with that of the other genera of Fagaceae. The pollen grains were examined using ultra-
thin sectioning technique under transmission electron microscope. The study shows that the
pollen exine ultrastructure of Nothofagus differs from that of the other genera of Fagaceae by
its exine structure and thickness, type of aperture, and ornamentation. The pollen exine of
Nothofagus is thin and possesses granular bacules, regular foot layer and tectum, spinulate
ornamentation, and the endexine is usually visible at poral area, and 5～8 colpate. The pollen
exine of the other genera of Fagaceae possesses entire bacules, irregular foot layer and tec-
tum, granulate and tuberculate ornamentation, thicker endexine, and is 3-colporate ( 3-colpate
or 3-colporoidate). The pollen exine ultrastructure of Nothofagus may belong to primitive
type. The pollen exine ultrastructure data support Kuprianova’s opinion that Nothofagus
should be separated from Fagaceae and established as a monogenetic family, i.e. Nothofa-
gaceae.