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This illustration shows the cross-section of a stem of Botrychium: p, pith; x, xylem; m, ray; c, cambium; ph, phloem; e, endodermis; cr, cortex.

Botrychium

This illustration shows the cross-section of a stem of Botrychium: p, pith; x, xylem; m, ray; c, cambium;…

This illustration shows the cross-section of a single vascular bundle of corn stem: ph, phloem; x, small cells of the xylem; v, vessels of xylem; st, stereome that forms a sheath about the bundle; p, parenchyma of the stem.

Corn Stem

This illustration shows the cross-section of a single vascular bundle of corn stem: ph, phloem; x, small…

"Diagram to show the relation of the food-conducting tissues of the leaf to those of the stem; and in the stem the relation of these tissues of one year to those of preceding years. The dotted line between phloem and xylem stands for the cambium. The figures at the bottom of the diagram indicate the age in years of the zones of tissues in phloem and xylem." -Stevens, 1916

Food Tissues

"Diagram to show the relation of the food-conducting tissues of the leaf to those of the stem; and in…

"Cross section of a root in the region of the root hairs." -Stevens, 1916

Plant Root Hairs

"Cross section of a root in the region of the root hairs." -Stevens, 1916

"Portion of a cross section of a root of Allium ascalonicum. h, large central, tracheal tube; i, xylem, and l, phloem portion of the vascular bundle; n, cortex cells; 1, endodermis with thin-walled cell at k to admit passage of materials; m, pericycle or pericambium." -Stevens, 1916

A. Ascalonicum Root

"Portion of a cross section of a root of Allium ascalonicum. h, large central, tracheal tube; i, xylem,…

"Diagram showing some types of unusual growth in thickness...C, portion of a cross section of stem of Gnetum scandens; 1, 2, and 3 are successive rings of growth; m, is the pith; b, is a sclerenchyma ring. The xylem portions with the exception of the larger tracheal tubes are shaded, while the medullary rays, phloem and tissues intervening between the rings of growth and the outer cortes tissues are left white." -Stevens, 1916

G. Scandens Unusual Stem Growth

"Diagram showing some types of unusual growth in thickness...C, portion of a cross section of stem of…

"Gleichenia pubescens: transverse section of stem, showing the protostele." -Stevens, 1916

G. Pubescens Stem

"Gleichenia pubescens: transverse section of stem, showing the protostele." -Stevens, 1916

"Schizogenous resin duct in the young stem of ivy (Hedera helix), as seen in cross section. A, early, and B, later stage in the formation of the duct. g, the mature duct; c, cambium wb, phloem; b, bast fibers." -Stevens, 1916

Ivy Stem

"Schizogenous resin duct in the young stem of ivy (Hedera helix), as seen in cross section. A, early,…

"Pteris aquilina: transverse section of stem, showing the polystele." -Stevens, 1916

P. Aquilina Stem

"Pteris aquilina: transverse section of stem, showing the polystele." -Stevens, 1916

"Cross section of a portion of palm stem. e, xylem; f, phloem portions of vascular bundle; g, sclerenchyma tissue about vascular bundle; d, fundamental or ground tissue; c, larger tracheal tubes in vascular bundle." -Stevens, 1916

Palm Stem

"Cross section of a portion of palm stem. e, xylem; f, phloem portions of vascular bundle; g, sclerenchyma…

This illustration shows a vascular bundle enlarged: x, xylem; v, vessels or ducts; p, phloem; s, sieve tube; ac, accompanying cell; c, cambium; st, stereome.

Vascular Bundle

This illustration shows a vascular bundle enlarged: x, xylem; v, vessels or ducts; p, phloem; s, sieve…

Types of vascular bundles: "B, the collateral type, with phloem, h, standing in front of the xylem, k." -Stevens, 1916

Collateral Vascular Bundle

Types of vascular bundles: "B, the collateral type, with phloem, h, standing in front of the xylem,…

Types of vascular bundles: "A, the concentric type, with xylem, k, surrounding the phloem, h." -Stevens, 1916

Concentric Vascular Bundle

Types of vascular bundles: "A, the concentric type, with xylem, k, surrounding the phloem, h." -Stevens,…

Types of vascular bundles: "C, a portion of the radial type, shown complete in D, where the part outlined at a, corresponds to C. Corresponding parts are lettered the same in both figures; c, xylem; b, phloem; f, cambium ring; e, pericycle; d, endodermis. C and D are from the tap root of Vicia faba." -Stevens, 1916

Radial Vascular Bundle

Types of vascular bundles: "C, a portion of the radial type, shown complete in D, where the part outlined…