Studies on Pollen Morphology of the Genus Corylopsis

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Studies on Pollen Morphology of the Genus Corylopsis

Zhang Jin-Tan (Chang King-Tang), Zhang Da-Wei

Received:1900-01-01 Revised:1900-01-01 Online:1991-07-10 Published:1991-07-10
Contact: Zhang Jin-Tan (Chang King-Tang)

Abstract

Abstract:

The present paper describes the pollen morphology of 11 species of thc genus

Corylopsis (Hamamelidaceae). The pollen grains were all examined with light microscope and

scanning electron microscope.

Pollen grains of the genus are prolate, spheroidal or subprolate. Three size types are recog-

nized: (l) 18-23 μm, found in Corylopsis omeiensis Yang, C.gotoana Makino, C. himalayana

Griff and C.platypetala Rehd. et Wils. (2) 24-32μm, found in C. sinensis Hemsl., C.willmottiae

Rehd. et Wils., C.veitchiana Bean, C. brevistyla H.T.Chang, C.multiflora Hance, C.pauciflora

Sieb. et Zucc. and C.spicata Sieb. Zucc. (3) 34-39μm, found in C. wilsonii Hemsl. and C. cordata

Merrill. Pollen grains are 3-colpate and 4-colpate (only infrequently found in Corylopsis

sinensis Hemsl.); the exine is 2-layered, 1.25-2.50μm thick, distinctly reticulate, sexine al-

most equal to nexine in thickness. From the pollen morphology the genus is considered as a natu-

ral group.

Key words: Pollen morphology, Corylopsis, Hamamelidaceae

Zhang Jin-Tan (Chang King-Tang), Zhang Da-Wei. Studies on Pollen Morphology of the Genus Corylopsis[J]. .

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Studies on Pollen Morphology of the Genus Corylopsis

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