The secretory cavity seemed to originate from an epidermal cell and a subepidermal cell. 分泌囊起源于外果皮的一个表皮细胞和与其相对的表皮下细胞，这两个细胞相继进行不同方向的分裂，最终形成具有帽区和球区结构的成熟分泌囊。
Special subepidermal cells were found to exist beneath the epidermises of H. cordata stems and leaves and secretory cells were found to exist in the cortex and pith of the stems. 鱼腥草茎和叶的表皮下有特殊的皮下层细胞，茎的皮层和髓中有分泌细胞存在。
