MUSCI 



153 



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

 serve as capillary 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. 



Fig. 127. — A, portion of surface of leaf of .5". acutifolimn, cl, small chlorophyllous cells ; f, large 

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



F1G.J28.— Transverse section of stem of .S'.O'wit/iffMWzDill. jr, inner cells with colo'irless wall ; r, 

 outer layer of cells; «, peripheral layers of cells with orifices, Y ( x 900). (Aft rLuerssen.) 



