横分裂

随着顶细胞的发育，基细胞也进行横分裂产生上下两个细胞，上方一个体积略为增大而形成胚柄；

With the devel - opment of the apical cell , the basal cell undergoes transverse division to form two cells : the upper one forms the single cell suspensor ;

一般合子第一次分裂为横分裂，但偶见有斜分裂。

Generally , the frist division of the zygote is transversally occasionally , is obliquely .

胚的发育过程：合子横分裂是在授粉后40天左右。

The development of embryo : The transverse mitosis of zygote occurs about 40 days after pollination .

丝状体顶端以下细胞通过纵分裂形成管状叶状体，顶端细胞始终保持横分裂；

Pipelike thallus was formed by vertical-division of the middle protonema cells , and top-cell kept horizontal-division .

花后一天，合子进行第一次不均等的横分裂；

One day after flowering , the zygote started it 's unequal transversal division for the first time .

合子的第一次分裂为横分裂，形成由顶细胞和基细胞组成的2细胞原胚。

Its first division is transverse and result in a 2-celled proembryo which comprises an apical cell and a basal cell .

传粉后10小时左右，合子第一次分裂，为横分裂。

About the 10th hour after pollination , zygote divides for the first time . The division of the zygote is always transverse .

孢子首先分裂为2细胞结构，2细胞具有明显的极性，基细胞发育成为假根，顶端细胞不断进行横分裂形成丝状体；

Every spore divided into 2-cell structure after the first division , and this structure had obvious polarity . The base-cell developed into rhizoid , and the top-cell formed protonema by horizontal-division continually .

在这些方法中，机械加工法对扇型纤维横截面的分裂最为重要。

In the splitting of segmented fiber cross sections mechanical processes have the greatest importance among these methods .