219 



PAGE 



Sporangia smaJ], very abundant, form- 

 ing a copiously branched panicle quite 

 distinct from the leafy part of the frond ; 

 fronds pinnate or bi-tripinnatifid ; veins 

 free. Genus XLIX. 4ntmia Sw. 193 



Sporangia solitary (or in pairs) in the 

 axils of large overlapping clasping involu- 

 cres, which form spikes either on separate 

 pinnae or in lax rows along the edge of the 

 leafy ones. Fronds scandent ; pinnae in 

 pairs (conjugate), palmate lobed, pinnati- 

 fid or pinnate, veins forked free. 



Genus L. Lygodium Sw 194 



SUB-ORDER V. MARATTIACE^ 



Sporangia opening by a slit down one 

 side or a pore at the .apex without a ring, 

 usually joined together in concrete 

 masses (synangia), vernation circinate. 



Sporangia opening by a slit down the 

 side, sessile, very close to one another but 

 not concrete, arranged in linear oblong or 

 boat-shaped sori near the edge of the frond; 

 veins simple or forked, free ; fronds very 

 large, bipinnate, often only pinnate. 



