Asplenium. 85 



texture thinly herbaceous ; sori linear 20 —40 each side of the mid- 

 vein. N. Eng. to Ky. and Wis. ill. 



11. A. firmum, Kunze. Stipes 4' — 8' long, erect, grayish, 

 naked; fronds 6' — 12' long, 3' — 4' broad; pinnae 12 — 20 pairs, ob- 

 long-lanceolate, the point bluntish, the margin inciso-crenate, the 

 upper one narrowed suddenly at the base, the lower one obliquely 

 truncate ; sori short, falling short of both midvein and margin. 

 Fla. VI. 



****F'ronds bi — tripinnatifid. 

 t Texture somewhat coriaceous. 



12. A. Ruta-muraria, L. Stipes tufted, 2^—4' long, naked; 

 fronds ovate-deltoid, i' — 2' long, bi — tripinnate below, simply pin- 

 nate above ; the divisions rhombic-wedge-shaped, toothed or in- 

 cised at the apex ; veins flabellate ; sori few, elongated, soon con- 

 fluent. Vt. to Mich, and Ky. III. 



13. A. montanum,* Willd. Stipes tufted, 2' — 3' long, naked; 

 fronds 2' — 5' long, ovate-lanceolate, pinnate ; pinnae 3 — 7 parted 

 below, incised or toothed above ; veins obscure ; sori short, the 

 basal ones sometimes double. N. Y. to Ky., Ala., and Ark. III. 



tt Texture thinly herbaceous or membranous. 



14. A. Bradleyi,* D. C. Eaton. Stipes tufted, 2' — 3' long, 

 ebeneous, as is also the lower half of the rachis ; basal scales 

 brown-black, lanceolate-acuminate; fronds 3' — 7' long, oblong- 

 lanceolate, bipinnatifid ; pinnae 8 — 12 pairs, short-stalked or ses- 

 sile, ovate-oblong, the lowest not reduced, the largest pinnatifid 

 with oblong lobes toothed at the tip ; sori short near the midvein. 

 N. Y., E. Tenn., Ky., and Ark. HI. 



15. A. myriophyllum, Presl. Stipes tufted, 2' — 6' long ; fronds 

 3' — 10' high, delicately membranous, lanceolate, narrowed below 

 bi — tripinnate ; ultimate segments obovate-oblong, entire or 2 — 3 

 lobed ; veins single in each segment, bearing below the middle a 

 solitary oblong sorus. Fla. VI. 



16. A. cicutarium, Swz. Stipes tufted, 4' — 8' long, greenish, 

 naked; fronds 6' — 15' long, 4'— 6' broad, with 10—15 horizontal 

 pinnae on each side, the lower ones 2' — 3' long, i' broad, cut down 

 to the rachis into linear or oblong segments, which are once or 

 twice cleft at the apex ; rachis compressed and often winged ; sori 

 principally in two rows. Fla. VI. 



§ 2. ATHYRIUM, Roth. Veins free ; sori more or less curved, 

 sometimes horseshoe-shaped, often crossing to the outer or lower 

 side of the fruiting veinlet. ' 



15— 



