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"Radial longitudinal section through a hydatode from the leaf margin of Primula sinensis. i, upper, and j, lower epidermis; h, palisade cell; e, thin-walled parenchyma, called epithem; g, intercellular space; f, guard cell of a water stoma; k, tracheal elements." -Stevens, 1916

P. Sinensus Hydatode

"Radial longitudinal section through a hydatode from the leaf margin of Primula sinensis. i, upper,…

"Cross section of a portion of a leaf of Indian corn. a, upper and b, lower epidermis; c, c, palisade cells; n, border parenchyma containing starch within its chloroplasts; e, vascular bundle; d, d, stomata." -Stevens, 1916

Indian Corn Leaf Cells

"Cross section of a portion of a leaf of Indian corn. a, upper and b, lower epidermis; c, c, palisade…

"Cross section of a portion of the blade of a leaf, showing upper epidermis at a, lower epidermis at b, palisade parenchyma at c, spongy parenchyma at d, and tracheids from the end of a vein at e." -Stevens, 1916

Leaf Epidermis

"Cross section of a portion of the blade of a leaf, showing upper epidermis at a, lower epidermis at…

"Lizard's tail (Saururus cernuus). Portions of leaf-epidermis; U, upper epidermis; L, lower epidermis; ep, epidermal cell; st, guard-cells of the stomata." -Gager, 1916

Leaf Epidermis

"Lizard's tail (Saururus cernuus). Portions of leaf-epidermis; U, upper epidermis; L, lower epidermis;…

The longleaf pine commonly found in the South Atlantic and Gulf States. The leaves are 9 to 12 inches long.

Longleaf Pine (Pinus palustris Mill.). Two-thirds natural size. epidermis of leaf (magnified)

The longleaf pine commonly found in the South Atlantic and Gulf States. The leaves are 9 to 12 inches…

"Diagram to show the three general tissue regions of a leaf." -Stevens, 1916

Leaf Tissues

"Diagram to show the three general tissue regions of a leaf." -Stevens, 1916

"Semi-diagrammatic cross section of a leaf showing by arrows how the water passes from the tracheal elements of a vein into the border parenchyma cells, and thence into the palisade and spongy parenchyma, from which it evaporates into the intercellular spaces and passes from the leaf through the stomata. a, upper epidermis; b, lower epidermis; c, palisade parenchyma; g, spongy parenchyma; d, border parenchyma; e, tracheal elements; and the stippled cells bellow e, the phloem cells." -Stevens, 1916

Leaf Water Flow

"Semi-diagrammatic cross section of a leaf showing by arrows how the water passes from the tracheal…