VASCULAR CRYPTOGAMS 



The spores are of two kinds, one of which is many hundred times 

 larger than the other. The larger spores, or megaspores, produced in 

 megasporanges, are female ; the smaller spores, or microspores, produced 



Fig. 5. — Pilulariaghhuli/era L.j with FiG. 6. — Marsilea quadrifoUa L., with fructifi- 

 fructificatioD, natutal size. (After cation, natural size, and fructification en- 



Lueissen.) larged. (After Luerssen.) 



in mierosporanges, are male. The megaspore is not completely spherical, 

 but has a distinct apical protuberance, which at the period of maturity 

 is enveloped in a thick firm- layer termed the epispore, formed by the 



