100. PiLicEs. 453 



covered by distinct reflexed portions of the maroin of the 

 frond. ° 



tt Capsule opening irregularly, seated on a receptacle which ends 

 a vein at the edge of the frond. Ring ohligm, transverse, 

 complete. 



Tr. V. SYM.ENOPKYLLBJE. 



15. Tbichomanes. Capsules on a long filiform receptacle 

 ■within a cupshaped involucre of the same texture with the 

 frond. 



16. Htmenophyllttm. Capsules on a narrow subclavate 

 receptacle within a two-valved involucre of the same texture 

 with the frond. 



** Capsules vnthout an elastic ring. 



Suborder II. OSMUNDACE^. 



Young fi-onds circinate. Eachis woody. Capsules regularly 

 2-valved, stalked, in clusters at the extremity of the frond. 



Tr. VI. OSMUNDE^. 



17. OsMtrNBA. Capsules clustered, arranged in a branched 

 spike terminating the frond. 



Suborder III. OPHIOGLOSSACEiE. 



Young fronds straight. Rachis succulent. Capsules regularly 

 2-valved, sessile, in clusters on a separate branch of the frond. 



Tr. Vn. OPHIOOLOSSE^. 



18. BoTEYCHitTM. Capsules distinct, disposed in a compound 

 spike attached to a pinnate or bipinnate frond. 



19. Ophioglossum. Capsules connate, disposed in a simple 

 distichous spike attached to an undivided frond. 



Suborder I. Polypodiacea. Tribe I. Polypodies. 

 1. Cetpiogkam'me B. Br. Eock-brake. 



1. C. cris'pa (R. Br.) ; barren fronds 2 — 3-pinnate, leaflets 

 wedgeshaped or linear-oblong often bifid at the end, leaflets of 

 the fertile fronds oblong.—^. F. 39. Allosorus Bemh., iV. 103. 

 E. B. 1160. — Fertile frond nearly triangular. Veins alternate, 



