FILICES. (FERNS.) G33 



very near the margin ; indusimn round-reniform, convex, thickish, smooth. 

 Mountains of Georgia, and northward. Fronds bluish green, 1- 2 long, on 

 a short stipe, which, like the short thick rootstock, is shaggy with large brown 

 chaffy scales. 



2. POLTSTICHUM, Both, Schott. Jndusliim orbicular t fixed by the depressed 



centre. 



10. A. acrostichoid.es, Swartz. Fronds evergreen, thickish, smooth 

 and shining, lanceolate, the fertile ones tallest, pinnate; pinnae numerous, 

 short-stalked, oblong-lanceolate, auriculate at the base on the upper side, cune- 

 ate at the lower, obtuse or acute, finely serrate or incised with spinulose-pointed 

 teeth ; the upper pinna? of the fertile frond contracted and covered with the 

 copious fruit-dots; iudusium round, peltate, smooth and entire. Shady and 

 rocky woods. Fronds l-2 high. Rootstock and stipe very chaffy. 



3. EUASPIDIUM, Uudvv. Indusium orbicular, peltate : veins reticulate. 



11. A. trifoliatum, Swartz. Frond thin, cordate-ovate in outline, 3- 

 lobed, or 3-foliate, the ovate pinnae entire or 3-lobed, acuminate, the margins 

 undulate ; sori scattered ; involucre peltate, orbicular. Heruando County, 

 Florida ( Curtiss). Frond 1 or less long, barely longer than the slender stipe. 



17. NEPHROLEPIS, Schott. 



Fruit-dots at the ends of the veins, in a series near the margin of the pinnae. 

 Indusium reuiform, often broadly so, fixed by the sinus, or by the arcuate 

 base, open obliquely toward the margin of the pinnae. Fronds pinnate, elon- 

 gated ; the pinnae articulated to the rachis. Veins free, forked from the mid- 

 rib, their apices thickened. 



1. N. exaltata, Schott. Fronds linear, indefinitely elongated, unfolding 

 numerous pinnae, which are oblong-lanceolate, auriculate on the upper side of 

 the base, rouuded on the lower side, falcate, crenately serrate; fruit-dots 

 large ; indusium reniform or crescent-shaped, the oblique sinus narrow and 

 deep or broad and shallow on the same pinna;. South Florida. Fronds 

 1- 6 long, 2' - 3' wide, usually pendent from the trunks of trees. 



18. PHEGOPTERIS, Fee. 



Sori small, round, naked, borne on the back of the veins below the apex, 

 otipe continuous with the rootstock. Veins free. 



1. P. hexagonoptera, Fee. Fronds annual, broadly triangular, bi- 

 pinnatifid ; pinnae lanceolate, acuminate, spreading, the lower pair erect; pin- 

 nules oblong, mostly obtuse, crenately toothed or entire ; fruit-dots numerous, 

 minute. Shady woods. A foot or more high from an elongated creeping 

 rootstock. Pinna? decurrent, forming irregular hexagonal wings on the rachis. 



2. P. polypod.ioid.es, Fee. Frond triangular-ovate ; pinnae approxi- 

 mate, hairy, narrowly lanceolate; fruit-dots marginal. (Polypodium Phegop- 

 teris, L.) Mountains of North Carolina and Tennessee. Stipe 6' -9' long. 

 Frond 4' - 6' broad. 



3. P. tetragona, D. C. Eaton. Frond erect, pubescent, 2 high, the 

 stipe sharplv 4-angled ; pinna? in distant pairs, nearly sessile, lanceolate, acu- 



