A Study on Pollen Morphology of Eucommia ulmoides Oliver

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A Study on Pollen Morphology of Eucommia ulmoides Oliver

Zhang Yu-Long, Wang Fu-Hsiung, Chien Nan-Feng

(Institute of Botany, Academia Sinlca, Beijing)

Received:1900-01-01 Revised:1900-01-01 Online:1988-10-18 Published:1988-10-18
Contact: Zhang Yu-Long

Abstract

Abstract:

Eucommia ulmoides Oliver is endemic to China. The pollen morphology and exine

ultrastructure were examined under LM, SEM and TEM. Pollen grains are prolate, polar

axis 30.5-54.8 μm long, with the average 32.7 μm, equatorial axis 27.8-31.3 μm long, with

the average 29.2 μm, tricolporoidate, but sometimes the outline of ora could be observed and

elliptic in shape. Colpi are narrow, uequal in length, often two long and one short or two

short and one long, sometimes rather irregularly arranged, with indistinct and thin colpus

membrance. Exine psilate under LM, granulate under SEM, and shortly baculate under

TEM. Tectum is thin with dense and small granules, columellae layer consists of short ba-

cules, and foot layer very thick.

Some taxonomists (Cronquist, 1968) consider that Eucommiaceae is related to Hamameli-

dales, but others (Takhtajan, 1969) to Urticales. The Urticales is of the porate type of pollen

grains, while Eucommiaceae of tricolporoidate type, and thus the former is more advanced

than the latter. Pollen grains of some members of Hamamelidales, tricolporoidate, are simi-

lar to those of Eucommiaceae. We therefore consider that Eucommiaceae is related to Hama-

melidales.

Key words: Eucommia ulmoides, Pollen morphology, Exine ultrastructure

Zhang Yu-Long, Wang Fu-Hsiung, Chien Nan-Feng. A Study on Pollen Morphology of Eucommia ulmoides Oliver[J]. .

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A Study on Pollen Morphology of Eucommia ulmoides Oliver

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