The Restoration of the Genus Cyclocodon ( Campanulaceae) and Its Evidence from Pollen and Seed-coat

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The Restoration of the Genus Cyclocodon ( Campanulaceae) and Its Evidence from Pollen and Seed-coat

HONG De-Yuan, PAN Kai-Yu

Received:1900-01-01 Revised:1900-01-01 Online:1998-03-10 Published:1998-03-10
Contact: HONG De-Yuan

Abstract

Abstract:

The genus Cyclocodon Griff. was reduced by C. B. Clarke in 1881 into a section

of the genus Campanumoea. Our LM and SEM observations on pollen morphology show

that the pollen of all the three species in the former is 3-colporate with the exine sparsely

high-spinulose, whereas that of the two species in the latter is 5～8-colpate with the exine

relatively densely short-spinulose. SEM observations on seed-coat indicate that the primary

ornamentation of the seed-coat of the two species in Campanumoea (s. str. ) is characterized

by regular and polygonal areoles which are much larger than the radial walls in diameter and

by the bead-like secondary ornamentation on the radial walls, while that of the three species

in Cyclocodon is characterized by irregular-shaped areoles which are nearly equal to the radial

walls in diameter and by the rope-like secondary ornamentation on the radial walls. Thus,

the pollen morphology is closely correlated with the seed-coat morphology. Taking the char-

acteristics of pollen, seed-coat and gross morphology into consideration, the genus Cy-

clocodon is restored, separate from Campanumoea (s. str. ). One new combination, Cy-

clocodon celebicus (B1.)Hong, is made in the present paper. The genus Cyclocodon is con-

sidered closely related to Platycodon rather than to Campanumoa.

Key words: Campanulaceae, Campanumoea, Cyclocoden, Pollen, Seed-coat, Taxonomicalrevision

HONG De-Yuan, PAN Kai-Yu. The Restoration of the Genus Cyclocodon ( Campanulaceae) and Its Evidence from Pollen and Seed-coat[J]. .

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The Restoration of the Genus Cyclocodon ( Campanulaceae) and Its Evidence from Pollen and Seed-coat

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