外方为最先分化成熟的木质部,称原生木质部 (Protoxylem),导管直径较小,多呈环纹或螺纹;后分化成熟 的木质部,称后生木质部 (metaxylem),导管直径较大,多呈 梯纹、网纹或孔纹。
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protoxylem lacuna [植] 原生木质部腔隙
protoxylem pole [植] 原生木质部极
protoxylem strand 原生木质部束
protoxylem vessel 原生木质部导管
protoxylem m 初生木质部
endarch protoxylem 内源型先成木质部
protoxylem gap 原生木质部隙
N the first-formed xylem tissue, consisting of extensible thin-walled cells thickened with rings or spirals of lignin 原生木质部 → compare metaxylem
It is found in protoxylem and first metaxylem tracheids and vessels.
可在原生木质部和初始后生木质部的管胞和导管中见到。
Protoxylem the PRIMARY xylem elements that are formed from the procambium first.
初生木质部的成分，最早由原形成层形成。
Annular thickening rings of thickening laid down on the inner wall of protoxylem vessels and tracheids.
环状加厚：原生木质部导管和管胞的内层环状増厚。
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