PTERIDOPHYTES 



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 



^ig. 129. A moonwort (Botrychi- 

 vm), showing the leaf differen- 

 tiated into foliage and sporophyll 

 branches.— After Strasburger. 



Fig. i:30. The adder's tongne (Ophioglossutn 

 vulgaturri). showing two leaves, each 

 with a foliage branch and a much longer 

 sporophyll branch.— After Marion Sat- 



TERLEE. 



