bipinnate

tendrils bifurcate.Leaves bipinnate, or pinnate on upper branches, basal pinnae of bipinnate leaves usually 3-foliolate;

卷须回羽状，或在上部分枝羽状，基部回羽状通常具3小；

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；较年轻一回羽状复，较老回或三回羽状复。