232 



PEENS : BBITISH AMD FOEEIGN. 



162. PILULABIA, lArm. 



Plants with filiform leaves, from a creeping rhizome under 

 water. Sporangia {emieeptacles) radical (at the base of the leaves 

 on the rhizome), globose, coriaceous, 2-4-ceUed, 2-4-valved, each 



Genos 162. — Plant, natural size. No. 1. 



cell containing different kinds of bodies : — 1. (AntJieridangia), 

 consisting of vesicles containing many minute granular spores; 

 2. {Oapluyridangia), each containing a single large spore. 



1. P. globulifera, lAmi. ; Willd. Sp. PI. 5, p. 535 ; Bolt. 

 Fil. t. 40 ; Schh. Crypt, t. 173 ; Bng. Bat. t. 521. — 

 Europe ajid Britain. 



163. ISOETES, Imm. 



Plants with awl-shaped leaves, from a thick creeping rhizome 

 under water or out of water. Sporangia {conceptades) borne in the 



