蕨的中柱(stele)类型是多种多样的,主要有原生中柱(protostele)、管状中柱(siphonostele)、网状中柱(dictyostele)和具节中柱。
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protostele e 原生中柱
medullated protostele 具髓原生中柱
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N a simple type of stele with a central core of xylem surrounded by a cylinder of phloem: occurs in most roots and the stems of ferns, etc 原生中柱
Haplostele a type of protostele having a solid strand of stele with the xylem on the inside encircled by phloem pericycle and endodermis.
单中柱:原生中柱的一种类型,是由韧皮部、中柱鞘和内皮层包围着内方的木质部构成的实心中柱。
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