Exotesta is stone-hard, mesotesta coriaceous, endotesta membranaceous. 外种皮石质，中种皮革质，内种皮膜质；
The endotesta consists of one layer of sclereids with inner tangential and radial walls thickened very much. 内种皮由1层径向延长的细胞构成，内切向壁与部分径向壁非常增厚。
A gap of endotesta exists in the chalazal region and is filled up with a group of pigment cells.The outline of the pigment cell group looks like trumpet-shaped. 合点区内种皮出现缺口，缺口间的合点区色素细胞群整体轮廓呈刺叭状。
A gap of endotesta exists in the chalazal region and was filled up with a group of pigment cells.The outline of the pigment cell group looks like a crescent. 合点区内种皮出现缺口，缺口间充满合点区色素细胞，其整体轮廓成新月形。
