BSA Plant Images Online - Ontogenetic sequence of primary xylem elements (from bottom to top) with annular secondary wall thickenings (rings) gradating to helical thickenings in a moderately stretched cell.
Ontogenetic sequence of primary xylem elements (from bottom to top) with annular secondary wall thickenings (rings) gradating to helical thickenings in a moderately stretched cell.
Publisher
Botanical Society of America
Additional data
copyright: Katherine Esau and Jennifer Thorsch, BSA
license: http://images.botany.org/index.html#license