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轮钟花属的恢复及其花粉和种皮证据

洪德元, 潘开玉   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1998-03-10 发布日期:1998-03-10
  • 通讯作者: 洪德元

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

摘要:

光学显微镜和扫描电镜观察表明,金钱豹属(广义)花粉明显分为两个类型:Campanumoea inflata和C.javanica subsp.laponica的花粉5~8沟,外壁具相对密的短刺,刺高不过1μm,而C.lancifolia,C.celebica和C.parviflora的花粉3孔沟,外壁刺稀疏,高于2μm。种子表面纹饰也同样可分为  两类,前两个种一类,其种子表面网状,网眼规则而多角形,直径大于网脊宽度,网脊上的次级纹饰为念  珠状,而后三种为一类,其种子表面网眼不规则,直径与网脊宽度近相等,网脊上的次级纹饰绳索状。可  见花粉特征与种皮性状是高度相关的。后三个种所属的分类群就是被归并了的属Cyclocodon Griffith。  综合花粉、种皮及外部形态,这个属应予恢复。其近缘属应是Platycodon,而不是Campanumoea。

关键词: 桔梗科, 金钱豹属, 轮钟花属, 花粉, 种皮, 分类修订

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