CHARACTERS OF TRIBES AND GENERA. 237 



lanceolate fronds, growing in csespitose tufts ; but in that 

 species the fronds are deltoid, and distinctly produced on a 

 slender creeping underground sarmentum, in all respects 

 similar to Phegopteris and Dryopteris, an apparent natural 

 affinity which is overruled 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 Davallia alliance, but with this it has 

 no relationship. 



Sp. C. fragilis, B&rnh. (v v.) ; C. dentata, Hook, (v v.) ; 

 C. regia (Linn.') (v v.) ; C. fumarioides, Kze. ; C. tenuis 

 (Sw.) (v v.) ; C. bulbifera (Linn.) (v v.) ; C. montana 

 {Linn.} (v v.) 



126. WOODSIA, E. Br. (1813). 

 Hook. Sp. Fil. ; Physematium, Kaulf. ; Hymenocystis, Meyer. 



Vernation fasciculate, erect acaulose. Fronds caespitose, 

 bi-tripinnatifid, rarely pinnate, 6 to 12 inches high, smooth, 

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

 exterior branch sporangiferous on or below its apex. Sori 

 pnnctiform. Indusium calyciform, its margin nearly entire 

 or deeply laciniated, lacinae usually terminating in long 

 hairs, which involve the sporangia. 



Type. Polypodium Ilvense, Sw. 



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. 77; 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 



