lo6 OUR NATIVE FERNS AND THEIR ALLIES 



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

 vein and margin. Florida, Arizona. 



**** Fronds bi — tripiiuiatifid. 



t IVxfure somew/iaf coriaceous. 



13. A. ruta-muraria L. Stipes tufled, 2' — 4' long, naked ; 

 fronds ovate-deltoi J, i' — 2' long, bi — tripinnate below, simply 

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

 incised at the ap^-x ; veins flabellate ; sori few, elongate, soon 

 confluent. V^ermout to Michigan and Kentucky. 



14. 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 bascd ones sometimes double. Lantern Hill, 

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

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



15. A. Glenniei Raker. Siipes 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 

 {Leminon) . 



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

 scaly at base ; fronds 3' — 6' long, \' — i' wide, tapering both ways 

 from above the middle; pinnaj 10 — 15 pairs, their segments 

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

 segment. Lycoming County, Pa. {McMinn), Springfield, Ohio 

 Spetice). 



tt Texture thinly herbaceous or membranous. 



17. 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. 



18. A. rhizophyllum Kunze, 7>ar. myriophyllum Mett, 

 Stipes tufted, 2' — 6' long; fronds 3' — 10' long, lanceolate, bi — 

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

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



