MUSCI 



153 



thickenings and circular orifices, similar to those of the leaves. These 

 serve as caj^illary tubes, through which the water of the bogs in which 

 these mosses grow is raised, and the whole plant is in consequence 

 always saturated with water like a sponge. 



7? '^ 



Fig. 127.—^, portion of surface of leaf of 6". acittifolium. cl, small chlorophyllous cells ; f, large 

 empty cells ; /, orifices in these cells. B, transverse section (magnified). 



Fig. 128. — Transverse section of stem of ^. (ywi^//i7//z«;^ Dill, x, inner cells with colourless wall ; r, 

 outer layer of cells ; ee, peripheral laj-ers of cells with orifices, / ( x 900). (Aft r Luerssen.) 



