IN BRYOPHYTA 35 
Taking Catharinea undulata (L.), 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 Avzccza, and both show localised 
apical growth, but their relations remain substantially the same. The “ Moss 
FIG. 19. 
Catharinea (A trichum) undulata (L.), Web. and Mohr. The leafy gametophyte, bearing 
sporogonia. (After Schimper.) 
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 Azccca. In most Mosses the 
plant is ill protected against drought; but they commonly show, as a set 
