ORDER 159. FILICES. 425 



1 C. rlilzophyllus Lk. Frond 612', subentirc, at base stipitate, cordate, or trun- 



cate, or somewhat auriculate, the apex attenuated in a long thread-like acmtination, 

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



2 C. piimatifldus(Nutt). Frond 4 8', abrupt at base, pinnatifid, with a long at- 



tenuated apex inclined to root ; sori large, at length confluent. Pa. to Tenn. Rare. 

 |3 ebenotdta. 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. oflloiimrum Willd. Frond simple, ligulate, acute, entire, cordate at base, 8 15'; 



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



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

 indnsium fixed beneath the sorus, early opening above it, with a multifid 

 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 ciliie Nos. 2 4 



1 W. obtusa Torr. Fronds 6 12', lance-oblong, pmoothish, almost tripinnate ; pn. 



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

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



2 W. ilveiisis Br. Frond 1', lanceolate, bipinnate, the stipe, rachis, mid-veins and 



their bristly chaff rust-colored ; pn. oblong-obtuse, sessile, with 1317 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. piunatifid, 



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



32. CISTOPTERIS, Beruh. 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, 6 1(X, on a slender stipe of the eame length, 



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

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



2 C. bulbifera. Bernh. Frond long-lanceolate, 1218', the stipe shorter; pn. tr.an- 



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

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



33. ASPIDIUM, L. SHIELD FERN. Sori orbicular, scattered, termi- 

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

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



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



the upper side at base. x Fronds simply pinnate Nos. 14 



x Fronds bipinnate Nos>. 5, 6 



$ NEPIIRODIUM. Indusium roundish, with a sinus on one side (subrenilbrm). . (a) 



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



a Frond once-and-a-half pinnate. y Segments thin, quite entire Nos. 8 1 1 



y Segments thick, finely serrate Nos. 12, 13 



o Frond twice pinnate. 2 Segments bluntly iobed, or crenate or entire. . .Nos. 14, 15 

 z Segments* sharply serrate, or Iobed or toothed. .Noc. 16, 11 



