124 



PLANT STEUCTUEES 



called a pseudopodium, or "false stalk," and in the top of 

 it is imbedded the foot of the sporogonium carrying the 

 globular capsule (Fig. 105, G). 



74. True Mosses. — This immense and most highly organ- 

 ized Bryophyte group contains the great majority of the 

 Mosses, which are sometimes called the Bryum forms, to 

 distinguish them from the Bjihagnum forms. They are 



Fig. 106. Different stages in tlie development of tlie leafy gametophore from the pro- 

 tonema of a common moss (FnnaHa): A, the first few cells and a rhizoid {r)\ JB, 

 C. later stages, showing apical cell (1) and young leaves (S); D, later stage much 

 less magnified, showing protonemal filaments and the young gametophore (^gam) 

 — After Campbell. 



the representative Bryophytes, the only group vying with 

 them being the leafy Liverworts, or Jiiiif/erDifninuttovxns. 

 They grow in all conditions of moisture, from actual sub- 

 mergence in water to dry rocks, and they also form exten- 

 sive peat deposits in bogs. 



The thallus body of the gametophyte is made up of 

 branching filaments (Figs. 81, 103), those exposed to the 



