frond GRE

fronds of bracken.

欧洲蕨的。

an unexpanded fern frond

未展开的蕨

the green fronds feathered against a blue sky.

绿在蓝天下摇曳。

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

有梗瓶尔小草的多形性和色体数目.

fern fronds uncurling in the spring air.

羊齿在春风中伸展开来

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.

形态：地生，柄丛生，基部黑色；较年轻的子一回羽，较老的子二回或三回羽。

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），有形成花冠的似羽的长

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，二回羽分裂或三回羽分裂，囊群位于的边缘；在一些分类中归入桫椤科。