haptera

常见例句

On drying out, the arms, or haptera, act in similar manner to the elaters of liverworts, and are thus termed elaters.See elater.
这种中柱类型存在于象莱尼蕨这样一些著名的原始维管植物中。
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.
单中柱：原生中柱的一种类型，是由韧皮部、中柱鞘和内皮层包围着内方的木质部构成的实心中柱。