442 MOSSES AND FERNS CHAP. 



work on these forms has led to a somewhat different conclu- 

 sion (Campbell (26) ). Both the anatomical structure, and the 

 character of the sporocarp and sporangium point to a not very 

 remote affinity with the Schizseacese. This view would har- 

 monise better with BelajefFs views as to the structure of the 

 antheridium in Marsilia. The two genera of the Marsiliacese 

 are evidently very closely related, and of these Pilularia ap- 

 proaches nearer the homosporous Ferns. The accompanying 

 diagram shows the relationship assumed here. 



