106 OUR NATIVE FERNS AND THEIR ALLIES 



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

 vein and margin. Florida, Arizona. 



**** Fronds bi tripinnattfid. 

 t Texture somewhat coriaceous. 



13. 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. 



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 basal ones sometimes double. Lantern Hill, 

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

 tucky, and Arkansas. 



15. A. Glenniei Baker. Caudex erect, with dark brown, 

 linear-setaceous scales; stipes densely tufted, ' i' long, cas- 

 taneous ; fronds 3' 4' long, oblanceolate, bipinnate; pinnae 

 20 25 pairs, lanceolate, the lower gradually reduced, cuneate- 

 truncate ; pinnules 5 6 pairs, oblong, toothed or externally 

 sub-entire ; sori, one at base of each pinnule, or two or more on 

 lowest anterior. Huachuca Mountains, Arizona (Lcmtnori). 



ft Texture thinly herbaceous or membranous. 



16. A. Bradley! 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 

 sessile, ovate-oblong, the lowest not reduced, the largest pinnat- 

 ifid with oblong lobes toothed at the tip ; sori short, near the 

 midvein. Ulster County, New York; East Tennessee, Ken- 

 tucky, and Arkansas. 



17. A. rhizophyllum Kunze, var. myriophyllum Mett. 

 Stipes tufted, 2' 6' long ; fronds 3' 10' long, delicately mem- 

 branous, lanceolate, narrowed below, bi tripinnate ; ultimate 

 segments obovate-oblong, entire or 23 lobed ; veins single in 

 each segment, bearing below the middle a solitary oblong sorus. 

 Forms with fronds narrowly linear, ' i' wide and widely as- 



