12 FLORA. 



narrowed at either end. On rocks, preferring limestone, throughout nearly the 

 whole of N. Am. Also in Europe and Asia. 



6. Asplenium viride Huds. (I. F. f. 51.) Rootstock stout, creeping, with 

 brown nerveless scales. Stipes numerous, densely tufted, brownish below, green 

 above ; leaves linear-lanceolate. 5-20 cm. long, 8-20 cm. wide, once pinnate, pale 

 green, soft, herbaceous or almost membranous; rachis green; pinnae 12-20 pairs, 

 ovate or rhomboid, deeply crenate, obtuse, unequal sided, their upper edges nar- 

 rowed suddenly at the base, the lower obliquely truncate ; sori oblong and num- 

 erous or scattered and fewer. On rocks, N. B. and Vt. to Br. Col. Also in 

 northern Europe and Asia. 



7. Asplenium angustifolium Michx. (I. F. f. 52.) Rootstock stout, creep- 

 ing, rooting throughout. Stipes growing in a crown, brownish or green above, chaff- 

 less, 2-3 dm. long, sometimes slightly scaly toward the base ; leaves lanceolate in 

 outline, 3-6 dm. long, once pinnate, glabrous ; pinnae 20-30 pairs, linear-lanceolate, 

 or those of the sterile leaves lanceolate, acuminate at the apex, obtuse or truncate at 

 the base, 5-12 cm. long flaccid, the margins entire or slightly crenulate ; fertile 

 leaves commonly taller than the sterile, narrower, their pinnae generally much nar- 

 rower, often falcate ; sori 20-30 on each side of the midrib, linear, crowded. In 

 moist woods P. Q. to Wis. south to Va. and Ky. 



8. Asplenium Ruta-muraria L. (I. F. f. 53.) Rootstock short, ascending. 

 Stipes tufted, naked, green, 5-7 cm. long ; leaves ovate or deltoid-ovate in outline, 

 512 cm. long, glabrous, evergreen, 2 3 -pinnate or pinnatifid above ; pinnae and pin- 

 nules stalked ; pinnules rhombic or obovate, mostly obtuse, dentate or incised, cune- 

 ate at the base ; veins flabellate ; sori few, linear-oblong, confluent when mature and 

 covering nearly the whole pinnule, the indusium membranaceous and delicate. On 

 limestone, Vt. to Mich., Conn., Ala. and Mo. Also in Europe, Asia and N. Africa. 



9. Asplenium montanum Willd. (I. F. f. 54.) Rootstock short, chaffy at 

 the summit. Stipes tufted, naked, slender, blackish at the base, 5-7 cm. long ; 

 leaves 5-20 cm. long, ovate -lanceolate in outline, acuminate at the apex, rather 

 firm, 1-2 pinnate ; lower pinnae longest, pinnate or pinnatifid, the lobes or seg- 

 ments ovate or oblong ; upper pinnae less divided, merely toothed or incised ; veins 

 obscure ; sori linear-oblong, short, the lower ones sometimes double, usually abun- 

 dant, often confluent at maturity and concealing the narrow membranous indusia. 

 On rocks, Conn, and N. Y. to Ga., west to O. and Ark. 



10. Asplenium fontanum (L.) Bernh. (I. F. f. 55.) Rootstock short, 

 ascending, with narrow dark scales at the apex. Stipes tufted, 2.5-7 cm. long, 

 somewhat blackish at the base especially on the inner side, usually glabrous ; 

 leaves lanceolate, broadest above the middle, thin, 2-3 pinnate, 7-15 cm. long. 

 1-3 cm. wide, acuminate at the apex, narrowed to the base ; pinnae 10-15 P a i rs > 

 the segments deeply dentate with spinulose teeth ; sori only I to 4 on each segment, 

 covered with a membranous subentire indusium, rarely confluent. On rocks, 

 Lycoming Co., Pa., and Springfield, O. Also in Europe. 



11. Asplenium Bradleyi D. C. Eaton. (I. F. f. 56.) Rootstock short, chaffy 

 with brown scales. Stipes tufted, slender, 5-7 cm. long, chestnut-brown; leaves 

 oblong -lanceolate or oblong, acuminate at the apex, not narrowed at the base, 

 pinnate with 8-12 pairs of short-stalked or sessile, oblong-ovate pinnae, the lower 

 again pinnatifid or pinnate with oblong obtuse lobes or pinnules, which are toothed 

 at the apex, the upper pinnatifid with dentate or nearly entire lobes; rachis brown; 

 sori short, borne near the midrib, covered with the narrow indusium until maturity. 

 On rocks, often preferring limestone, N. Y. to Ga. and Ala., west to Ark. 

 Local. July-Sept. 



12. Asplenium acrostichoides Sw. (I. F. f. 57.) Rootstock sinuous, creep- 

 ing. Stipes 2-3 dm. long, straw-colored, somewhat chaffy below at least when 

 young ; leaves lanceolate in outline, 3-9 dm. long, 1.5-3 dm. wide, acute or 

 acuminate at the apex, narrowed to the base, pinnate-pinnatifid ; pinnae linear- 

 lanceolate, sessile, acuminate, deeply pinnatifid into numerous oblong obtuse or 

 subacute, slightly crenate segments; sori crowded, slightly curved or straight, the 

 lower ones often double; indusium light-colored and somewhat shining when young. 

 In rich moist woods, N. S. to Minn., south to Ga. and Ala. Also in E. Asia. 



13. Asplenium Filix-foemina (L.) Bernh. (I. F. f. 58.) Rootstock creep- 

 ing, rather slender for the size oi the plant. Stipes tufted, 1.5-2.5 dm. long, 



