Text-book of structural and physiological botany . Fig. 83 II.—Longitudinal section (partly dia-grammatic) through the young embryo of theshepherds purse ; h epidermal tissue ; r cor-tical tissue ; 711 fundamental tissue or pith;f procambium ; w root-cap ; .y suspensor. ..(After Hanstein, magnified : see fig. 363.). Fig. 84.—Papilla from the youngstigma of Lilium bulbifertiin.(x 660.) the subjacent masses of tissue is the more evident the greaterthe exposure of the part of the plant to air and light, and is alsousually more conspicuous in the permanent parts than in thosewhich are more fugitiv
Text-book of structural and physiological botany . Fig. 83 II.—Longitudinal section (partly dia-grammatic) through the young embryo of theshepherds purse ; h epidermal tissue ; r cor-tical tissue ; 711 fundamental tissue or pith;f procambium ; w root-cap ; .y suspensor. ..(After Hanstein, magnified : see fig. 363.). Fig. 84.—Papilla from the youngstigma of Lilium bulbifertiin.(x 660.) the subjacent masses of tissue is the more evident the greaterthe exposure of the part of the plant to air and light, and is alsousually more conspicuous in the permanent parts than in thosewhich are more fugitive. In the lowest plants, Alga^, Fungi,and Lichens, and even in the stem of Hepaticae, the epidermalstructure consists only in the outer layers of ceUs havingthicker and firmer cell-walls and smaller cavities than the 5 8 Striicttiral and Physiological Botany. rest. In some Mosses and in all the more highly organisedplants at least one layer of cells specially defined and de-veloped, the epidermis^ exercises special functions. In trueroots, and in many root-like underground stems, as well asin many plants which grow submerged in water, it is lessdifferentiated from the subjacent tissue than is the case inmost stems and in leaves. The outer side of the outermost layer of epidermal cells is graduallytransform
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