in some classification systems placed in family Polypodiaceae; terrestrial ferns of cosmopolitan distribution mainly in southern hemisphere: hard ferns
双语例句
用作名词 (n.)
One of a number of families into which the family Polypodiaceae has been subdivided in some classification systems,includes genera Blechnum,Doodia,Sadleria,Stenochlaena,Woodwardia. 在某些分类系统中细分的水龙骨科成员的一个科，乌毛蕨属，水龙骨属，狗脊属。
