IC6 OUR NATIVE FERNS AND THEIR ALLIES. 



one obliquely truncate ; sori short, falling short of both mid- 

 vein and margin. Florida, Arizona. 



**** F ron ds bitripinnatifid. 



t Texture somewhat coriaceous. 



14. A. ruta-muraria L. Stipes tufted, 2' 4' long, naked ; 

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

 pinnate above ; the divisions rhombic-wedge-shaped, toothed or 

 incised at the apex ; veins flabellate ; sori few, elongate, soon 

 confluent. -Vermont to Michigan and Kentucky. 



15. 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. Lantern Hill, 

 Connecticut, and Ulster County, New York, to Georgia, Ken- 

 tucky, and Arkansas ; Cuyahoga Falls, Ohio (Kirby). 



16. A. Glenniei Baker. Stipes densely tufted, \' i' long, 

 castaneous; fronds 3' 4' long, bipinnate; pinnae 20 25 pairs, 

 lanceolate, the lower gradually reduced ; pinnules 5 6 pairs, 

 toothed or externally sub-entire. Huachuca Mountains, Arizona 

 (Lemmon). 



17. A. fontanum (L.) Bernh. Stipes i' 3' long, slightly 

 scaly at base ; fronds 3' -6' long, V i' wide, tapering both ways 

 from above the middle; pinnae 10 15 pairs, their segments 

 deeply dentate with spinulose teeth ; sori one or two to each 

 segment. Lycoming County, Pa. (McMinri), Springfield, Ohio 

 Spence). 



ft Texture thinly herbaceous or membranous. 



18. A. Bradley! D. C. Eaton. Stipes tufted, 2' 3' long, 

 ebeneous, as is also the lower half of rachis; fronds 3' 7' long, 

 pinnatifid ; pinnae 8 12 pairs, the lowest not reduced, the 

 largest pinnatifid with oblong lobes toothed at the tip; seri 

 short. Ulster County, N. Y., Lancaster, Pa., Kentucky, Ten- 

 nessee, and Arkansas. 



19. A. myriophyllum Mett. Rootstock short; stipes 

 tufted, 2' 6' long; fronds 3' 10' long, lanceolate, bi- tripin- 

 nate ; segments entire or 2 3-lobed, bearing a single vein 

 and sorus. Forms with fronds narrowly linear, f i' wide, and 



