209 



PAGE 



formed of the slightly changed margin of 

 the frond. 



Veins forked, free ; pinna; unequal-sided 

 or equal-sided. Gems XI. Liids.ya Dryand. 51 



Veins more or less uniting. Pinnae un- 

 equal-sided or equal-sided. 



Gems XII. Schizoloma Gaud. 52 



TRIBE VI. PTERIDE*: 



Sori marginal, oblong or in a line. 

 Indusium formed oi a more or less changed 

 and rerlexed margin of the frond opening 

 inwardly. 



Sori marginal, rounded or in a' line, 

 usually numerous and distinct, sometimes 

 conrluent and continuous, bearing the 

 sporangia on the underside ; veins free. 



Gtiius XIII. Adiantum L. 56 



Indusium roundish and distinct, or more 

 or less conrluent, but not continuous, 

 sporangia on the underside of the frond, 

 veins tree. Gems XIV. Chtilaatfus Sw. 75 



Indusium quite continuous, sori linear, 



continuous, occupying a slender filiform 



receptacle in the axis of the indusium. 



Veins free, rarely those of the last division 



14 



