frond GRE

The polymorphy of fronds and chromosome number of Ophioglossum petiolatum Hook.

有梗瓶叶的多形性和染色体数目.

The apical cell and basal cell act as the ancestor cells of frond and rhizoid.

两个细胞分别成为叶片和根的祖细胞。

Characteristics: Terrestrial ferns; stipes tuft, backlish at base; young fronds pinnaye with wider pinnae, when getting older, the fronds become bipinnate or tripinnatifid with slender pinnules.

地生，叶柄丛生，基部黑色；较年轻的叶子一复叶，较老的叶子二或三复叶。

Under the upswelling tide he saw the writhing weeds lift languidly and sway reluctant arms, hising up their petticoats, in whispering water swaying and upturning coy silver fronds.

在惊涛骇浪的海潮底下，他看到扭滚着的海藻正懒洋洋地伸直开来，勉强地摇摆着胳膊，裙裾撩得高又高，在窃窃私语的水里摇曳并翻转着羞怯的银叶。