BSA Online Image Collection, Xylem Development

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Vesicles occur near the surface of the exposed wall	Ontogenetic sequence of primary xylem elements	Side wall between two differentiating vessel members	Side wall between differentiating vessel members	Side wall between vessel members with differentiating helical thickenings


Wall between older and younger vessel members	Vessel member and parenchyma cell	Degradation of primary wall of vessenl member	Later stage of end wall degradation	Nucleus in a xylem parenchyma cell


Rim of secondary wall material	Protoplast of differentiating vessel member with part of end wall	Section through xylem region of a vascular bundle drawn from electron micrographs