PTEKIDOPHYTES 



149 



Among the Bryophytes the sporogenous 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 moonwort (Botrychi- 

 um), showing the leaf differen- 

 tiated into foliage and sporophvll 

 branches.— After Stkasburger. 



Fig. 130. The adder's tongue (Ophioglossum 

 vulgattnti), showing two leaves, each 

 with a foliage branch and a much longer 

 sporophyll branch. — After iMiRiox Sat- 



