File:Herbaceous Dicot Stem Xylem Vessels Cucurbita (35463815631).jpg
long section: Cucurbita stem
magnification: 400x
Date
Source
Herbaceous Dicot Stem: Xylem Vessels Cucurbita
Author
Berkshire Community College Bioscience Image Library
<a href="http://blogs.berkshirecc.edu/bccoer" rel="nofollow">Berkshire Community College Bioscience Image Library</a>
Walls of xylem vessels have lignin free pits and lignin thickenings that form rings, spirals, networks and solid blocks.
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