lanceolate fronds, growing in cespitose 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, Bernh. (v v.); C. dentata, Hook. (v v.) ; 
C. regia (Linn.) (v v.); C. fümarioides, Kze.; C. tenuis 
(Sw.) (v vi: C. bulbifera (Linn.) (v v.); C. montana 
(Linn.) (v v.) 
196.—Woopsi, R. Br. (1813). 
Hook. Sp. Fil. ; Physematiwm, Kaulf. ; Hymenocystis, Meyer. 
Vernation fasciculate, erect acaulose. Fronds cespitose, 
bi-tripinnatifid, 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, lacine usually terminating in long 
hairs, which involve the sporangia. 
Type. Polypodium Ilvense, Sw. 
Ilust. 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. 
Oss.—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 ` ` : 
CHARACTERS OF TRIBES AND GENERA, 8B o 
