作 者 ：WANG Ping-Li, PU Fa-Ting, ZHENG Zhong-Hua
期 刊 ：植物分类学报 1998年 3期
Keywords:Pollen morphology, Trigonobalanus, Colombobalanus, Formanodendren, Fagaceae,
Abstract:
The genus Trigonobalanus consists of three species which are disjunctly distributed
in Asia and South America. Pollen grains of T. doichangensis (Camus) Forman, T.
verticillata Forman and T. excelsa G. Lozano, J. Hdz-C. et J. He-nao were examined un-
der light microscope (LM), scanning electron microscope (SEM), laser scanning confocal
imagine system(MRC-600) and transmission electron microscope(TEM). Pollen morphology
of these species of Trigonobalanus showed great variation in shape, aperture position and
structure of exine. The pollen morphology of Trigonobalanus may be divided into three
types: (A)Pollen grains of T. doichangensis are suboblate, with P/E=0.88～0.96, broad
elliptic in equatorial view, obtusely triangular in polar view; 3-colporate, goniotreme,
vestibulate and thickened on margin; the exine 2-layered, the thickest in aperture area, tec-
tate-imperforate, verrucose-rugulose (SEM). (B) Pollen grains of T. excelsa are prolate,
with P/E = 1.23 ～1.55, long-elliptic in equatorial view, trilobate or subtriangular in polar
view; 3-colporoidate (3-colpate), pleurotreme (pretrime); tectate-perforate, crass-tubercu-
late or verrucose (SEM). (C) Pollen grains of T. verticillata are subsphaeroidal with P/E
= 1.10～1.18, subcircular in equatorial view, trilobate-circular in polar view; 3-colporate,
pleurotrime; tectate-perforate, fine-tuberculate or vermiculate short-striate (SEM). The
pollen morphology of the three species of Trigonobalanus well supports the view-point of
Nixin and Crepet to treat them as three monotypic genera, i.e. Formanodendren (F.
doichangensis(Camus) Nixon et Crepet), Colombobalanus (C. excelsa (G. Lozano, J.
Hdz-C. et J. Henao)Nixon et Crepet) and Trigonobalanus (T. verticillata Forman). The
results also show that the three genera are closely related to Fagus and Ouercus.