S YNOPSIS 



THE GENERA OF FEENS. 



CLASSIFICATION. 



FiLlOALES^Acrogenous plants, with dorsal or marginal one-celled 

 spore-cases. 



* Spore- cases furnished with a jointed, ring, which 



is usually nearly complete, sometimes rudi- Order. 



mentary ............... POLYPODIACE^ 



t Spore-cases not valvate. 



|i Ping vertical, nearly /complete, spore-cases usually 

 stalked, gibbous, bursting transversely... ... 



[A] Eeceptacles universal, i.e., occupying almost 



or quite the entire disk of the fertile fronds, 

 both veins and parenchyma ...... 



[B] Eeceptacles effuse, occupying a crowded mass 



of reticulated veinlets, forming large amor- 

 phous portions or separate lobes of the 

 fronds, or sometimes definite in form ... 



[c] Eeceptacles local, circumscribed, i.e., confined 

 to determinate parts of the veins, definite 

 in form. 



(1) Sori transverse to the veins (when distinct 



veins are present) ; parallel or sub-parallel 



with the midrib or margin; more or less 



elongated, usually linear ; occasionally ob- 



long or Innately curved; rarely punctiform 



(then marginal with transverse indusia). 



(a) Eeceptacles seated on or approximate to 



the midrib, therefore costal or sub-costal 



(often at the same time marginal by the 



contraction of the frond) ; linear or ob- 



long. 



(a) Sori linear superficial indusiate ... 



(b) Sori linear or oblong, superficial or 



J.noe 1. 

 POLYPODINEJE. 



! 

 AciOSticheSB, 



immersed, non-indusiate 



[March, 1857.] 



3. 

 LomarieSJ. 



4. 



... Pleurogrammeae. 



