PTEBIDOPHYTE8 



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 



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FIG. 129. A moonwort (Botrychi- 

 tim), showing the leaf differen- 

 tiated into foliage and sporophyll 

 branches. After STHASBUHGEK. 



28 



FIG. 130. The adder's tongue ( Ophiogtoesum 

 vulgaturri), showing two leaves, each 

 with a foliage branch and a much longer 

 sporophyll branch. After MAKIOX SAT- 



