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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;…

"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

"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

"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

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…