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。
Annular thickening Rings of thickening laid down on the inner wall of protoxylem vessels and tracheids.
原生木质部导管和管胞的内层环状増厚。
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