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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;…

"Portion of a colony of Corallium rubrum, showing expanded and contracted zooids. In the lower part of the figure the cortex has been cut away to show the axis, ax, and the longitudinal canals, lc, surrounding it." — The Encyclopedia Britannica, 1910

Corallium Rubrum

"Portion of a colony of Corallium rubrum, showing expanded and contracted zooids. In the lower part…

"Portion of a colony of <em>Corallium rubrum</em>, showing expanded and contracted zooids. In the lower part of the figure the cortex has been cut away to show the axis, ax, and the longitudinal canals, lc, surrounding it." &mdash;Encyclopedia Britannica, 1910

Colony of Collarium Rubrum

"Portion of a colony of Corallium rubrum, showing expanded and contracted zooids. In the lower…

This illustration shows the longitudinal section of the tip of a growing stem: e, epidermis extending over surface of the entire tip; a, formative region; b, upper portion of the zone of elongation; c, cortex; x, cells of the central region that by further growth form the vascular bundles; l, first appearance of the leaves.

Growing Stem

This illustration shows the longitudinal section of the tip of a growing stem: e, epidermis extending…

Section through the right kidney from its outer to its inner border. Labels: 1, cortex; 2, medulla; 2' , pyramid of Malpighi; 2", pyramid of Ferrein; 5, small branches of the renal artery entering between the pyramids; A, a branch of the renal artery; D, the pelvis of the kidney; U, ureter; C, a calyx.

Section of the Right Kidney

Section through the right kidney from its outer to its inner border. Labels: 1, cortex; 2, medulla;…

"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