pith mother cell 髓母细胞
There was hypha in 1- 10layers cell of surface in young tumour-body base. Grown tumour-body formed periderm, vascular bundle and a lot of pith cells.
幼期的瘤状体基部表面1—10层细胞内含菌丝，长大的瘤状体形成周皮，内部形成大量维管束和髓；
But outer pith cell of hollow center potato was bigger than that of normal one, and the cell wall was thicker. But the wall of pith cell was thiner than that of normal one.
空心块茎环髓区细胞壁厚度比健康块茎的厚，而心髓区细胞壁厚度则比健康块茎的薄；
Right now notochord cell disappears, pith nucleus becomes a fiber cartilage with soft and less cell gradually.
此时脊索细胞消失，髓核逐渐成为一个软而细胞较少的纤维软骨。
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