1.Leaf buttress A leaf primordium, appearing as a protuberance on the side of the stem apex, produced by periclinal division of the tunica and corpus, and associated with a procambium.
叶原座:顶端分生组织上的侧生突起发育成叶的原基,与原形成层有关。
2.The proter's oral primordium appears (under the pellical, too) anterior to the parent AZM2, from which membranells 7―11 of AZM1, the whole AZM2, PM and one of the frontal cirri will be originated;