纵分裂分为切向分裂与径向分裂，切向分裂增加管状叶状体管周细胞数从而使管体增大，径向分裂形成管外壁突起细胞，最终发育为分枝；
Vertical-division included tangential-division and radial-division , tangential-division made the pipelike thallus more thick , and radial-division made the branch formed .
径向分裂