Stems

Vascular bundle (amphiphloic) from the rhizome of Osmunda ferns	Another Osmunda vascular bundle view showing the darkly stained endodermis	Osmunda vascular bundle surrounded by ring of thick-walled fibers
Vascular bundle (plectostele) from a Lycopodium stem	Selaginella stem with close-up of vascular bundle	Another view of a vascular bundle from Selaginella
Vascular bundle from Polypodium fern	Amphiphloic vascular bundle in Polypodium	Psilotum cross-section
Psilotum stem - cross-section showing stele (protostele)	Closer view of one pole of the xylem tissue in a Psilotum stem	Psilotum stem - longitudinal section through stele showing secondary wall structure in tracheids and fibers
Another Psilotum stem in longitudinal view showing the range of cells from fibers at the right to early tracheids at left	Pine apical meristem	Pine stem tip
Vascular trace near the tip of a pine stem	Close-up of pine vascular trace shown in image to the left. From left to right in this trace would be protoxylem, procambium, and protophloem	Radial-longitudinal view of xylem in a pine stem with primary xylem left of center
Young pine stem in cross-section	Young pine stem in cross-section	Young pine stem in radial-longitudinal section
Longitudinal section through the tip of a pine stem bud	Close-up of part of the pine stem bud shown at left. The procambium leading into one of the leaf primordia is visible from the elongated cells and their nuclei	Back from the pine stem tip, the procambium has produced primary xylem and phloem
Vascular bundles in Helianthus stem	Close-up of Helianthus vascular bundle showing the group of phloem fibers capping the bundle	Cross-section of Ranunculus stem
Wide view of a Helianthus stem showing epidermis, cortex, vascular bundles and pith; Note collenchyma just inside the epidermis	Helianthus stem vascular bundle	Vitis stem in longitudinal view
Aristolochia stem	Aristolochia stem	Aristolochia stem vascular bundle
Cucurbita stem	Cucurbita stem, note bicollateral phloem	Cucurbita stem phloem with two sieve plates visible at center
Medicago stem	Medicago stem vascular bundle	Medicago stem, longitudinal view, note simple perforation plate just above center
Tilia two-year stem	Platanus stem	Platanus stem
Ranunculus stem vascular bundle	Ranunculus stem vascular bundle, note guard cell pair in epidermis	Vascular bundle in Lilium stem.
Outer region of a Lilium stem showing thick-walled cells of the cortex	Smilax stem in cross-section	Asparagus stem in cross-section
Closer view of an Asparagus stem vascular bundle	Draceana stem vascular bundles	Closer view of Draceana stem vascular bundles
Yucca stem cross-section.	Yucca vascular bundles - one in cross-section, one in longitudinal section	Yucca stem longitudinal section showing secondary wall structure of xylem elements