Fig. 26 



Piliilaria: A, habit of P. globidifera. Marsilea: b, habit of M. 

 quadrifolia; c, vertical section of sporocarp; d, horizontal 

 section of sporocarp; e, dehiscing sporocarp; f, male game- 

 tophyte; g, female gametophyte of M. vestita; h, embryo within 

 female gametophyte 



(f, foot ; 1, leaf; r, root ; x, stem apex) 



(b, after Meunier; c, d, Eames — much simplified; E, Eames; f. 

 Sharp; g, Campbell; h, Sachs) 



cussion, but it can most conveniently be regarded as a 

 tightly folded pinna (Hke a clenched fist) enclosing a number 

 of elongated sori, each covered by a membranous indusium. 

 Figs. 26C and 26D represent, very diagrammatically, the 

 structure of the sporocarp of Marsilea as seen in vertical and 

 horizontal sections, respectively (for clarity, the number of 

 sori has been reduced to two rows of five). Each receptacle 

 bears microsporangia laterally and megasporangia termin- 

 ally, and receives vascular bundles from a number of strands 



169 



