pinnae

1.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；较年轻的叶子一羽状复叶，较老的叶子二或三羽状复叶。