358 FERNS 



organs of a fern do not severally correspond with those of a 

 moss. The leaves of a moss are not homologous with those 

 of a fern but are rather comparable to lobes of the pro- 

 thallus : in the same way the rhizoids of a moss correspond 

 not with the complicated roots of the fern but with the 

 rhizoids of the prothallus. 



