(5)中柱鞘和栓内
细胞富含单宁类物质；
(5) Tanning materials are abundant in pericycle cells and phelloderm cells;
,
(5)中柱鞘和栓内细胞富含单宁类物质；
(5) Tanning materials are abundant in pericycle cells and phelloderm cells;
The periderm is the secondary protective tissue of the rhizome, and is composed of pellem, pellogen and phelloderm;
周
由木栓
、木栓
成和栓内组成；
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