630 FILICES. (FERNS.) 



ones incised ; divisions toothed or serrate ; fruit-dots very short, the basal ones 

 often with a double indusium. Mountains of Alabama, and northward. 

 Fronds 2'- 5' high, with a winged greenish rachis, and a stipe nearly as long 

 as the frond. 



11. A. Ruta-muraria, L. Fronds small, ovate, pinnate above, bipin- 

 nate below, the divisions stalked, obovate-cuneate, toothed at the apex ; veins 

 forked from the base ; fruit-dots few, indusia laciuiate at the margin. Rocks 

 along the mountains. Fronds 2' -4' high. 



12. A. Bradleyi, Eaton. Frond thin, pinnate below, piunatifid above, 

 lanceolate-oblong, barely acute, 3' - 1' long ; pinna? short-stalked, oblong-ovate, 

 the lowest ones lobed or piunatifid. Mountains, Alabama to North Carolina. 

 Rootstock short. Stipe smooth, black. 



13. A. cicutarium, Swartz. Tufted from a short rootstock, 3' - 1 2' high, 

 smooth; stipe blackish ; frond thin, ovate or oblong, pinnate or nearly hipiu- 

 nate; pinnae lanceolate, obtuse ; pinnules oblique, entire on the lower edge, 

 toothed on the upper, with the teeth 2 3-cleft; sori in two rows. Sumter 

 County, South Florida. 



14. A. myriophyllum, Tresl. Fronds delicately membranaceous, lan- 

 ceolate, narrowed below, 2-3-pinnate ; ultimate segments obovate-oblong, en- 

 tire or 2 - 3-lobed ; veins single in each segment or lobe, bearing below the 

 middle a solitary oblong fruit-dot. Cavernous limestone rocks, Florida. 

 Fronds 3'- 10' high, with short stipes and narrowly winged rachises. 



15. A. thelypteroides, Michx. Fronds ample, oblong-ovate, pinnate ; 

 the deeply pinnatifid pinnae lanceolate-acuminate from a broad sessile base; 

 me lower ones smaller, distant, and deHexed ; the lobes oblong, obtuse, cre- 

 nateh serrate ; fruit-dots 8-12 to a lobe, at length confluent, those next the 

 midrib toward the ends of the pinme mostly double; indusium convex, thick- 

 ish. Hicli woods in the upper part of Georgia, and northward. Fronds 

 l-3 high. 



2, ATHYRIUM, Roth. Indusium thin, attached to the upper side of t/ie 

 rein ; or rf curved and crossing the vein, attached to both sides of it, thus 

 becoming reniform or shaped like a horseshoe. 



16 A. Filix-fcemina, Eeruh. Fronds ample, ovate-oblong ; pinna? lan- 

 ceolate, numerous; pinnules oblong or lanceolate, doubly serrate or variously 

 incised ; fruit-dots short, at length confluent. (Aspidium Filix-fcemina, 

 Swartz ?) Low shady woods, Florida to Mississippi, and northward. 

 Fronds l-3 high. A. asplenoides (Aspidium asplenoides) is said to differ 

 in having a creeping caudex. 



14. SCOLOPENDRIUM, L. HART'S TONGUE. 



Sori as in Asplenium, but the involucres arranged in pairs, and opening 

 towards each other. 



1. S. vulgare, Smith. Stipe smoothish, 2' -3' long from a thick root- 

 stock; frond lanceolate-oblong, acute, slightly serrulate, cordate at the bnso, 

 6' -9' long, the upper half fruit-bearing. Shaded rocks, Tennessee, and 

 northward. 



