S8. ASPLENIUM. § 3. EU-ASPLENltJt. 449 



X.X. Pinnae iO — 48 c.M. long, with the upper 

 base rather truncate or rotundato-cuneate. 



(47a) A. nigrescens. 

 (476) A. militare. 

 S.S. Higher sori erecto-patent, not subparallel to the costa. 

 3. Lower pinnae reduced, suborbicular or subcordate. 



(48) A. pellucidum. 

 3.3, Lower pinnae not or hardly reduced. 



4L. Pinnae suddenly narrowed from a broad base 

 into a narrow point. Sti/pes ± black. 



(49) A. dimidiatum. 

 A.A. Pinnae not suddenly narrowed into the point. 

 Stipes mostly green, grey or brown. 

 S. Pinnae narrow, to ± jS'/j ^•^- broad. 

 e. Pinnae varying from crenulate to m- 

 ciso-crenate. 



7. Crenulate. (SO) A. Cesatianum. 

 7.7. Inciso-crenate. 



S. Stipe and rachis fibrillose. 

 (Bl) A. crinicaule. 

 S.S. Stipe and rachis ± scaly 

 or nearly naked. 



(82) A. acutiusculum. 

 «.«. Pinnae serrate, toothed or lobed. 

 ^. Rachis strigoso-paleaceous. 



(53) A. impressum. 

 ■ir.^. Rachis naked or slightly scaly. 

 +. Pinnae ascending. Sori rath- 

 er regular, ± 5 — 6-fugate. 

 (54) A. Gardneri. 

 +.+. Pinnae spreading. Sori rath- 

 er irregular, more numerous. 

 (55) A. adiantoides. 

 S.S. Pinnae broader, ^'/i'^'^Vj ''•^- ^oad. 

 ^. Pinnae minutely 2-serrate. 



(56) A. Sancti-Christophori. 

 4'»+« Pinnae entire, cremate or irreqularly 

 and sharply toothed.^ / o & C--i 

 PiLICES. 29 



