Palynological Evidence for Taxonomy of Trigonobalanus (Fagaceae)

Abstract

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.

Key words: Pollen morphology, Trigonobalanus, Colombobalanus, Formanodendren

WANG Ping-Li, PU Fa-Ting, ZHENG Zhong-Hua. Palynological Evidence for Taxonomy of Trigonobalanus (Fagaceae)[J]. .

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Palynological Evidence for Taxonomy of Trigonobalanus (Fagaceae)

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