CHAEACTERS OF TRIBES AND GENEEA. 237 



lanceolate fronds, growing- in cnsspitose tufts ; but in tbat 

 species the fronds are deltoid, and distinctly produced on a 

 slender creeping' underground sarmentum, in all respects 

 similar to Fhegopteris and Dryopteris, an apparent natural 

 affinity which is overri;Lled by the technical character in the 

 sori of the latter being naked. On account of the cucullate 

 indusia, this genus is by Sir William Hooker and other 

 authors placed in the DacalUa alliance, but with this it has 

 no relationship. 



Sp. C. fragilis, Bernh. (v v.) ; C. dentata, Hool\ (v v.) ; 

 C. regia {Linn.) (v v.) ; C. fumarioides, A're. ; C. tenuis 

 {Sw.) (v V.) ; C. bulbifera (Linn.) (v y.) ; C. montana 

 {Linn.) (v V.) 



12G.— WOODSJA, E. Br. (1S13). 

 Eool. Sp. Fil. ; Phijsrniatiuni, Kmtlf. ; Hijmenocijstii;, Meyer. 

 Vernation fasciculate, erect acaulose. Fronds casspitose, 

 bi-tripinnati£id, rarely pinnate, 6 to 12 inches high, smooth, 

 or squamiferous. Veins simple or forked, free, the lower 

 exterior branch sporangiferous on or below its apex. Sori 

 punctiform. Indusium calyciform, its margin nearly entire 

 or deeply laciniated, lacinas usually terminating in long- 

 hairs, which involve the sporangia. 

 Type. Polypodium Ilvense, Sio. 



Illust. Hook, and Bauer Gen. Fil., t. 3 and 119 ; Hook. 



Gard. Ferns, t, 32 ; Moore Ind. Fil, p. 82 ; J. Sm. 



Ferns, Brit, and For., fig. T? ; Hook. Syn. Fil., t. 1, 



fig. 11. 



Obs. — This genus consists of about a dozen known 



species, chiefly natives of the Northern hemisphere, being 



widely dispersed over Europe and Northern Asia and 



America, reaching even to the Arctic circle, and in Southern 



