In more primitive organisms, thick borders line scalariform perforation plates in this material. Bordering of this tissue determines amphiphloicity or ectophloicity, and it contains long cells called libriform fibers and specialized cells called tracheids. Guttation occurs when (*) root pressure forces material from this tissue out of hydathodes, and the walls of this tissue are highly lignified. 
In more primitive organisms, thick borders line scalariform perforation plates in this material. Bordering of this tissue determines amphiphloicity or ectophloicity, and it contains long cells called libriform fibers and specialized cells called tracheids. Guttation occurs when (*) root pressure forces material from this tissue out of hydathodes, and the walls of this tissue are highly lignified. This tissue is produced by the vascular cambium and functions by exerting transpirational pull. For 10 points, name this tissue that primarily transports water, which comprises the plant vascular system along with phloem.
In more primitive organisms, thick borders line scalariform perforation plates in this material.
xylem