| 释义 |
metaphloem
metaphloem[¦med·ə′flō·əm] (botany) The primary phloem that forms after differentiation of the protophloem. metaphloem
metaphloem the typical PHLOEM that develops from the procambium next to the protophloem, towards the stem centre. It has normal SIEVE TUBES, in contrast with the small simplified sieve tubes of protophloem which lack companion cells. |