METHODS 



II 



The cells of the ventral part of thr midrib have thick wall* in which 



These piu are in line* extending round 



the cell, and forming partial spiral*, this being perhaps due to the longi- 

 tudinal growt These cells, which are pre- 



little protoplasmic fotrttnft, thu< 



agreeing with 1 .mslcy's description of the correspondifig tittue in other 

 >ers of the genus ( i ) . The celU of the cortical tmue of the rhimne 

 contain many starch granules, in this re*|>oct recalling Caver*' figures 3! 

 Morkia flowtoiviana \ 



A 

 3 



Fig. 5. Pallavitinta Z oiling fri, 

 Two frond* of female plant*. \ 



The base of the aerial shoot, or frond, like the rhizome of which it is 

 the c like lamina found in the 



expanded portion of the frond. The - il stalk, as it ascends, be- 



comes gradually flattened dorsi- vent rally and develops a narrow wing 

 which v he beginning of the expanded. 



fan-shaped lamina of the hotomy occurs when the 



young frond is 3-4 cm. in height. The forking i< repeated from two to 

 four times, and there thu result* the palnu* led leaf-like shoot, the 



lender central strands of the delicate segments simulating almost exactly 

 the venation of a true leaf. In the archegonial plants these Can-shaped 



