常見例句On drying out, the arms, or haptera, act in similar manner to the elaters of liverworts, and are thus termed elaters.See elater. 這種中柱類型存在於象萊尼蕨這樣一些著名的原始維琯植物中。Hapteron (pl. haptera)1.See holdfast. 2.In species of Equisetum (horsetails), the outer wall of the spore, which forms an X-shaped structure, the arms of which are wraped around the spore. 單中柱：原生中柱的一種類型，是由靭皮部、中柱鞘和內(nèi)皮層包圍著內(nèi)方的木質(zhì)部搆成的實心中柱。 返回 haptera