| Abstract: | The genus Cyclocodon Griff. was reduced by C. B. Clarke in 1881 into a sectionof the genus Campanumoea. Our LM and SEM observations on pollen morphology showthat the pollen of all the three species in the former is 3-colporate with the exine sparselyhigh-spinulose, whereas that of the two species in the latter is 5～8-colpate with the exinerelatively densely short-spinulose. SEM observations on seed-coat indicate that the primaryornamentation of the seed-coat of the two species in Campanumoea (s. str. ) is characterizedby regular and polygonal areoles which are much larger than the radial walls in diameter andby the bead-like secondary ornamentation on the radial walls, while that of the three speciesin Cyclocodon is characterized by irregular-shaped areoles which are nearly equal to the radialwalls 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 characteristics of pollen, seed-coat and gross morphology into consideration, the genus Cyclocodon is restored, separate from Campanumoea (s. str. ). One new combination, Cyclocodon celebicus (B1.)Hong, is made in the present paper. The genus Cyclocodon is con-sidered closely related to Platycodon rather than to Campanumoa. |
