FKHX-FLOIU OF CANADA. 



229 



GEMS. 



V. CyStOptoriS I'ioikIs all U-afy ; ituliisiiini a sni.ill, thin, poinUHl, sriHip-sli.ipi'tl scale 

 iir nu'inliraiif, att.-nhotl at its base to a vcimilc, ami at fust liitlin^: tho spore-cases, 

 (fij;'. 5, (1, n.'it. si/o, /;, culaixed). (Small terns, somewhat I lifted). 



\ !■ AdiOiXlttlXQ. l-'roiuls all leafy, unusually thin ami papery ; sori home ou spi'cial 

 involucres formed by upper portions o\' the mari.fins t>f the leatlt-ts oi the frond folded 

 back, the spore cases on their under sides. (A tather small tern with ag'j^reg'ated 

 but not tufted fronds). 



VII. OhsilStnthOS . Fronds all somewhat leafy, woolly or i"li ilTy ; involucres formed 



or retlexed portions o( the frond-marnin, spore cases on the fromi itself. (Small 

 Ferns.) • 



VIII. Ptsris. Fronds all leafy, hard, much-divided ; involucre parallel with and under 

 reflexed margin o'i pinnule, sjiiiie c.ises forniin<jf a continuous marjfinal line, (fi^. 6.) 

 (A very tall fern, fronds rising' singly from a runnint^ rhi/.onie.) 



IX. FollSl. I'^ronds all leafy, hard, rather dull-j<-reen, not much divideil, fertile ones 

 with narrower divisions ; the rel1ect»>d margins of the pinn;e formini;' imiusia ; spore 

 cases ca>wded m a continuous line. (Small ferns, not tutted.) 



X. CryptO^raniniO. infertile fronds leafy, britfht g-reen ; the fertile ones narrower, 

 contracted, and duller in colour ; involucre broad, appearing- m.arginal ; spore cases 

 crowded, continuous when the involucre opens. (A small tufted fern.) 



XI. Looaairia. infertile fronds leafy, (lying- flat on the g-round in our species), fertile 

 ores contracted (erect) ; indusium parallel to midrib and between it and marg-in oj 

 pinna ; spore cases in continuous lines. 



XII. T^OOdvrardia. Fronds all leaty, the pinna? of fertile ones narrowed ; indusia with 

 spore cases in clusters forming" a chain on each side of costa or midrib oi pinna. 

 (Medium sized fern, with strong- creeping- rhizome, fronds not tufted). 



XIII. AsplenlUlXlf F^ronds all leafy, sorus and indusium linear or oblong-, straig-ht, 

 attached long-itudinally to vein or veinule, and opening towards midrib, (fig^. 15). 

 (Mostly small ferns with fronds simply pinnate.) 



XI\ . Atliyritmi. Fronds all leafy ; sorus and indusium as in preceding genus, but 

 more or less curved or horse-shoe form (in some cases evanescent, or not developed), 

 attached to veinules, but not parallel with them, opening towards the costa, (fig'. 8.) 

 (Larg-e ferns, with delicately divided fronds.) 



XV. ScolopOlldriViai. Fronds all leafy (strap-shaped) ; sori long, straight, in pairs, 

 parallel to veinules, and covered at first by long' straight indusia opening- along- the 

 centre (fig. 7); (veins free). (Medium sized fern with undivided frond, except in 

 abnormal varieties). 



1 ! 



