frond GRE

fronds of bracken.

欧洲蕨的叶。

an unexpanded fern frond

未展开的蕨叶

the green fronds feathered against a blue sky.

绿叶在蓝天下摇曳。

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

有梗瓶尔小草叶的和色.

fern fronds uncurling in the spring air.

羊齿叶在春风中伸展开来

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假根的祖细胞。

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.

态：地生，叶柄丛生，基部黑色；较年轻的叶子一回羽状复叶，较老的叶子二回或三回羽状复叶。

A fern (Matteuccia struthiopteris) of northern temperate regions, having long plumelike fronds that form a crown.

荚果蕨：一种在气候温和的北部地区生长的蕨（荚果蕨荚果蕨属），有成花冠状的似羽的长叶

tree ferns of temperate Australasia having bipinnatifid or tripinnatifid fronds and usually marginal sori; in some classification systems placed in family Cyatheaceae.

分布于温带澳大拉西亚的树蕨，叶二回羽状分裂或三回羽状分裂，囊群位于叶的边缘；在一些分类中归入桫椤科。