ORDER 159. F1LICE8. 425 



1 C. rliizophyllus Lk. Frond 612', subentire, at base etipitate. cordate, ^r trun- 



cate, or somewhat auriculate, the apex attenuated in a long thread-like acmi^uation, 

 arched, and rooting at the point. Rocky woods. Not common. 



2 C. plnnatifidus(Nutt). Frond 48', abrupt at base, pinnatifid, with a long at- 



tenuated apes inclined to root ; sori large, at length confluent. Pa. to Tenn. Hare. 

 ft ebenotdes. Frond at base pinnate ; stipe black and polished. Near Phila. 



30. SCOLOPENDRIUM, Smith. HART'S-TONGUE. Sori linear, trans- 

 verse, scattered ; indusium double (arising from 2 contiguous parallel veins), 

 occupying both sides of the sorus, opening lengthwise along the middle. 

 S. officinarum Willd. Frond simple, ligulate, acute, entire, cordate at base, 815' ; 



stipe chaffy, 35'. Shady rocks, Chittenango, N. Y. (Sartwell). 



31. WOODSIA, Brown. ROCK POLYPOD. Sori roundish, scattered; 

 indusium fixed beneath the sorus, early opening above it, with a inultifid 

 or fringed margin, including the pedicellate spore-cases, like a calyx. 

 Small, tufted ferns, with pinnated fronds. 



Indusium closed over the sorus at first, toothed when open No. 1 



Indusium concealed under the sorus, fringed with ciliae Nos. 2 4 



1 W. obtiisa Torr. Fronds 6 12 r , lance-oblong, smoothish, almost trip-innate ; pn. 



distant, sessile ; segments pinnatifid, lobes rounded, toothed, each bearing a round 

 fruit-dot, which dot? at length almost meet. Rocks and cliffs. Vt. to Car., and W. 



2 W. ilveusis Br. Frond 4 V, lanceolate, bipinnate, the stipe, rachis, mid -veins and 



their bristly chaff rust-colored ; pn. oblong-obtuse, sessile, with 13 17 obtuse, subeu- 

 tire segments. Dry or rocky woods, in tufts. Stipe as long as the frond. 



3 W. glabella Br. Frond glabrous, lance-linear, 2 5' , pinnate ; pn. ovate, very ob- 



tuse, 24", 3-7-lobed, the upper only crenate. Cliffs, N. Y., Vt., and N. No chaff. 



4 W. Oregaiia Eaton. Frond glabrous, lance-elliptic, 28', pinnate pn. pinnatifid, 



obtuse ; segments ovate, obtuse, denticulate ; indusia with very short dike. L. Sup. 



32. CISTOPTERIS, Bernh. BLADDER FERN. Sori roundish. Indu- 

 sium hood-shaped, vaulted, fixed by the broad base (or by the base and 

 sides), soon opening toward the forward end of the frond and thrown off. 

 Delicate Ferns, 2-3-pinnate. 



1 C. fragills Bernh. Frond lance-oblong, 610', on a slender stipe of the same length, 



with open divisions ; pn. lance-ovate ; segments pinnatifid below, only serrate above, 

 oblong, with prominent veins and 410 sori. Shady rocks. Common. 



2 O. bulbifera. Bernh. Frond long-lanceolate, 12 18', the stipe shorter; pn. trian- 



gular-ovate, the lowest pair longest ; segments oblong, obtuse, pfnnatifid below, 

 toothed above, 1 sorus to each lobe. Bears some buiblets. Shades. 



33. ASPIDIUM, L. SHIELD FEKX. Sori 'orbicular, scattered, termi- 

 nal or lateral on the pinnate veins. Indusium orbicular, peltate or reni- 

 fonn with a deep sinus, covering the sorus, opening all around. 



$ ASFIDIUM. Indusium round, entire, centrally peltate. Pinna; mostly auricled on 



ths upper side at base. x Fronds simply pinnate Nos. 1--4 



x Fronds bipinnate Nos. 5, l> 



$ XEPHRODIUM. Indusium roundish, with a sinus on one side (subreniform). . (a) 



a Frond simply pinnate, with a few large pinnae. Cultivated. . . No. 7 



a Frond once-aud-a-half pinnate. y Segments thin, quite entire Nos. 811 



y Segments thick, finely serrate Nos. 12, 18 



a Frond twice pinnate. z Segments bluntly iobed, or crenate or entire. ..Nos. 14, 15 

 z Segments sharply serrate, or Iobed or toothed. .Nos. 16, 11 



