218 



PAGE 



sori on the contracted apex ; stipes adher- 

 ent to the rhizome. 



Genus XLVI. Gymnopteris Bernh. 183 

 Veins uniform, reticulate, meshes with- 

 out free included veinlets, no main veins 

 present ; fronds pinnate, the upper pinn?e 

 smaller ahd wriDlly covered with sporangia 

 on the under-surface. Stipes adherent to 

 caudex. Geius XLVII. Acrostichum L 19 1 



SUB-ORDER III. OSMUNDACE^ 



Capsule two valved, opening across the 

 apex with a short horizontal ring ; verna- 

 tion circinate. 



Fertile frond wholly on the upper or 

 middle portion contracted, forming simple 

 or compound panicles bearing sporangia ; 

 veins forked free ; fr >nds pinnate or bipin- 

 nate, articulated with the rachis. 



Genus XLVIII. Osmunda L. 192 



SUB-ORDER IV. SCHIZ^ACE^ 



Sporangia two- valved, crowned by a 

 complete apical ring. Vernation circinate. 



