PTERIDOPIIYTES 



149 



Among the Bryophytes the sporogenons tissue appears 

 very early in the development of the sporogonium, the pro- 

 duction of spores being its only function ; also there is a 



Fig. 129. A niooiiwort {Botrychi- 

 nm), showing the leaf differen- 

 tiated into foliage and pporophyll 

 branches.— After Stuasburgek. 



28 



Fig. 130. The adder's iongna {Ophioglossum 

 tulgatum), showing two leaves, each 

 with a foliage branch and a much longer 

 sporophyll branch. — After Marion Sat- 



TERLEE. 



