ORDER 159. FILICES. 425 



1 C. rhlzopliyllns Lk. Frond 6 12', subentire, at base stipitate, cordate, or tmn 



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

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



2 O. plnnatifldus(Nutt). Frond 4 8', abrupt at base, pinnatifld, with a long at- 



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



3 C. ebeiioicles (B. R. Scott). Fronds 4-10' long, pinnate, at base, pinnatifld above, 



tapering and rooting at apex ; rachis black. Pa. to Ala. Rare. 



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. officf narum Willd. Frond simple, ligulate, acute, entire, cordate at base. 8 15' ; 



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 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 some, fringed with cilise Nos. 2 4 



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



distant, sessile ; segments pinnatifld, 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. ilveasls Br. Frond 47', 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. Oregana Eaton. Frond glabrous, lance-elliptic, 28', pinnate ; pn. piunatifld, 



obtuse ; segments ovate, obtuse, denticulate ; indusia with very short cilia. 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. 



1C. fragf Its Bernh. Frond lance-oblong, 6 KX, on a slender stipe of the same length, 

 with open divisions ; pn. lance-ovate ; segments pinnatifld 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. trau- 

 gnlar-ovate, the lowest pair longest ; segments oblong, obtuse, ptnnatlfid 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- 

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



{ ASI'IDIUM. Indusium round, entire, centrally peltate. Pinnae mostly auricled on 



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



x Fronds bipinnate Nos. 5, 6 



g NEPHRODIUM. Indusium roundish, with a sinus on one side (subreniform).. (a) 



a^'rond simply pinnate, with a few large pinnae. Cultivated No. 7 



a Frond once-and-a-half pinnate. y Segments thin, quite entire Nos. 8 11 



y Segments thick, finely serrate Nos. 12, IS 



a Frond twice pinnate. z Segments bluntly Jobed, or creuate or entire. ..Nort. 14, 15 

 Segments sharply serrate, or lobed or toothed. .T T OB. 16, 1'- 



