The former is bunchy in the lengthways direction, and its transverse shape is irregular ellipse, circular, polygon with cavum.

• 前者的单纤维横截面呈不规则的椭圆形、腰圆形和多边形,且纤维内有中腔,而竹浆纤维呈锯齿形,截面内分布有很多大小不等的空洞;