THE GKEAT GROUPS OF BKYOI'Hi'TES HJ 



'@ M 



Fig. 100. Species of Lepidozm, a genus of leafy liverworts, showing diilerent leaf 

 forms, and in A and t'the dehiscence of the sporogonium by four valves. In G 

 rhizoids are evident; and in B, D, and E the three rows of leaves are seen, the 

 leaves of the ventral row heing comparatively small. — After Engler and Pkantl. 



Mosses, and possibly to the Pteridophytes also. The 

 thallus is very simple, being differentiated neither in 

 structure nor form, as in the two other lines ; but the 

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