羽片

Ching相似，但叶片的背面密被绒毛，表面被短柔毛，侧生羽片9–16对。

Ching in size , but differs by its lamina being tomentose on the lower surface and pubescent on the upper surface and having 9 – 16 pairs of lateral pinnae .

五种苏铁羽叶和羽片的生长发育

The Growth and Development of Frond and Pinna in Five Species of Cycads

带有羊齿羽片披针形复叶的蕨类。

Any fern of the genus doodia having pinnate fronds with sharply dentate pinnae .

或缩写。在同一靶中应使用同一形式和颜色之箭杆、羽片箭尾及箭饰。

Name or initials on the shaft , and all arrows used at any one end will carry .

当它被缠绕到箭轴上时，羽片的毛尖部分均指向箭尾凹口。

When it was wrapped around the shaft , the tips of the web all pointed back towards the nock .

此外，研究还发现羽片回数、叶柄颜色、叶尖和叶基类型等也有很重要的分类价值。

Furthermore , the research also found that pinnate , petiole color and type of leaf top or base were significant for the taxonomy too .

M.Chu相似，但羽片边缘无软骨质的膜质边，侧生羽片多达9–16对。

M. Chu in the lamina indumentum , but differs by pinnae lacking the membranous cartilaginous margin and having 5 – 16 pairs of lateral pinnae .

囊群椭圆形，由4～10个孢子囊组成，着生于小羽片背面，位于中脉的两侧；

The sori are borne on the abaxial surface of the pinnule , arranged in two rows parallel to the midvein , elliptic , and composed of 4-10 round sporangia .

在9种苏铁类植物叶轴的结构中发现，苏铁科6个种的叶轴都有与羽片一样的栅栏组织和海绵组织结构，这是植物适应环境的一种很进化的现象；

As the structure of the pinnaes , palisade and spongy tissues are found in the structure of the rachises of the 9 species of cycads , which is an advent appearance that cycads adapt to the environment .