Xylem Development		hi-res links (requires broadband)	page 1 of 2
Curtis, Lersten, and Nowak 2002 rev. 2019

Pinus (pine) tracheids with bordered pits and crassulae.

Pinus strobus (eastern white pine) tracheids.

Dicot leaf vein tracheids (SEM).

Cercidium (palo verde) leaf torn to show protoxylem in a minor vein (SEM).

Cercidium (palo verde) leaf torn to show pitted xylem cells in a minor vein (SEM).

Bignonia stem protoxylem.

Begonia protoxylem under polarized light.

Cucurbita protoxylem.

Cucurbita protoxylem with spiral and annular thickenings.

Spiral secondary wall from protoxylem (SEM).

Macerated Cucurbita stem protoxylem.

Ageratina altissima (white snakeroot) protoxylem.

Cucurbita maxima (pumpkin) protoxylem vessel element (SEM).

Cucurbita maxima (pumpkin) stem maceration: vessel element (SEM).

Ageratina altissima (white snakeroot) early xylem vessel development.

Ageratina altissima (white snakeroot) mature and developing xylem vessels.

Ageratina altissima (white snakeroot) stem longisection with mature and developing vessels.

Ageratina altissima (white snakeroot) xylem vessel development.

Ageratina altissima (white snakeroot) xylem vessel development.

Ambrosia trifida (giant ragweed) stem longisection with mature and developing xylem vessels under phase contrast.

Pastinaca (parsnip) vascular bundle cross section with protoxylem, metaxylem, procambium, and phloem.

Macerated Liriodendron (tulip-tree) stem with xylem vessel element with scalariform perforation plate; also fibers.

Macerated Cucurbita stem early metaxylem.

Vitis (Grape) wood tangential section with mature vessel.

Vitis (grape) wood with perforation plates on vessels.