EPIDERMIS. 177 
album, was formerly termed epiblema (Figs. 84, 119, 120, 121, 
122). : 
Occasionally, however, the epidermis consists of several layers, 
as, for example, in Macis (Fig. 85), and in many leaves (/icws), 
This multiple epidermis, which is also termed hypoderma,* con- 
sists, in the case of delicate organs, mostly of uniform, thin- 
Fie. 84, 
Fig. 83,—Longitudinal section through the outermost layer of Vanilla; a, epidermal 
cells, containing crystals of vanillin; b, cells with spiral fibres. 
Fic. 84.—Epidermal cells of a root (epiblema) on a transverse section; the dark cells 
represent the epiblema,. 
walled or slightly thickened cells (leaves of the Piperacee, 
Chavica and Peperomia, of the Begoniacex, and of species of 
1*Yzo0 under, and 6égua skin. We use the word only for the true 
multiple epidermis, not for the layers (collenchyma, bast-fibres) which 
impart strength to the single-rowed epidermis, 
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