I06 OUR NATIVE FERNS AND THEIR ALLIES. 



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

 vein and margin. Florida, Arizona. 



**** Fronds bi — tripinnatijid. 



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. Clenniei Baker. Stipes densely tufted, \' — 1' 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 1' — 3' long, slightly 

 scaly at base ; fronds 3' — 6' long, y — 1' 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. iJMcMinri), Springfield, Ohio 

 Spence). 



\\ Texture thinly herbaceous or membranous. 



18. A. Bradleyl 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 



