叶柄

Leaf base often narrowed into a petiole, spurless.

部通常缩小成为，无距。

Trema polygama, described from Yunnan, differs in having the inflorescences shorter than the adjacent petioles.

发表自云南，不同在于花序短于临近。

The development of xylem is of mesarch.Stomata are monocyclic type.

脉、、上胚轴维管束均为外韧型。

Leaves alternate, shortly petiolate, leathery, margin entire, venation pinnate or palmately triplinerved.

互，具短，革质，边缘全缘，羽状脉或者掌状离脉。

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，丛，部黑色；较年轻子一回羽状复，较老子二回或回羽状复。