No. 454] OPHIOGLOSSACE^E AND M A RSI LI ACE A^:. 



773 



young sporocarp of Marsilia and the fertile leaf segment of 

 Schizaea is remarkably similar ; moreover, the origin of the spo- 

 rangia from originally marginal cells is noteworthy. 



The origin of the sporocarps in the Marsiliaceae, however, 



same relation to the rest of the leaf, that the -V^^'^^^'^' ^^^^^ 

 Marsilia. The pinnate form of the sporocarp m Mars.ha an 

 the dichotomous sterile segment, are comparable to ^vhat obtams 



