896 



I. FILICES. 



Hymenophyllum* 



Portion of fructiferous 



frond. 



IlymtmophyUum, 

 Sporangia exposed by 



the removal of one 

 valve of the indusiu m 



Hymenophyllum. 

 Sporangium seen 

 in front (mag.)* 



Pie is a(/m"wa. 

 Portion of fructfepous frond. 



Pteris. 

 Indusium laid open to showthe 

 insertion of the sporangia. 



Pteris aqiiilina. 

 Prothallus [leveloped. (Thurct.) 



'/x -s 



^\ /f 



Pteris aquilina. Antheridia 

 and anthcrozoids. (Thuret.) 





Pleris aquilina, 

 Anthcrozoids (mag.). (Tbnret.) 



