IN BRYOPHYTA 



35 



Taking Catharinea undulata (L.), x Web. and Mohr, as an example of the 

 condition commonly seen in Mosses, the gametophyte and sporophyte are 

 both on a more advanced scale than in Riccia, and both show localised 

 apical growth, but their relations remain substantially the same. The " Moss 



FIG. 19. 



Catkarinea (Atrichiim) undnlata (L.), Web. and Mohr. The leafy gametophyte, bearing 

 sporogonia. (After Schiniper.) 



Plant," or gametophyte (Fig. 19) appears as an upgrowing, branched, and 

 leafy structure, attached to the soil by numerous rhizoids, and nourishing 

 itself partly from materials absorbed by them, partly by the activity of 

 its chlorophyll-containing shoots: it is thus physiologically an independent 

 organism, as is also the simpler thallus of Riccia. In most Mosses the 

 plant is ill protected against drought; but they commonly show, as a set 



