C.'^O FILICRS. (p'KUXS.) 



uiies iiicisi'il ; divisions tnotlicd or serralt; ; fiiiit-iluts very slnnt, tlic liusal ones 

 often witli a dnuUlc indiisiuni. — Mountains of Alahania, and nnrtliward. — 

 Fromls 2' -5' Iii^li, with a win<^ed greeiiisii racliis, and a stipe nearly :us long 

 as tlic fr<)n<l. 



11. A. Ruta-muraria, L. Fronds small, ovate, ])innate above, bipin- 

 nate i)elow, the divisions stalked, obovate-cuneate, toothed at the apex ; veins 



forked from the base; fruit-dots few, indusia laciniate at the margin Kocks 



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



12. A. Bradleyi, Katon. Frond thin, pinnate below, jiinnatifid above, 

 lauccolate-ubloHi;-, bai'elv acute, .'$'-7' long; pinn;e short-stalked, oblnng-ovate, 

 the lowest ones lobed or i)innatitid. — Mountains, Alabama to Js'ortli ( arnlina. 

 — Rootstock short. Stipe smooth, black. 



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

 smooth; stipe Idackish ; frond thin, ovate or oblong, pinnate or nearly bipiu- 

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

 toothed on the ni)])t'r. with the teeth 2— 3 cleft; sori in two rows. — Sumter 

 County, South Florida. 



14. A. myriophyllum, I'rc.sl. Fronds delicately membranaceous, lan- 

 ceolate, narrowL-d 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, witii short stipes and narrowly winged rachises. 



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

 the deeply ])innatitid pinna? lanceolate-acunn'nate from a broad sessile i^ase ; 

 the lower ones smaller, distant, and detiexed ; the lol)es oblong, obtuse, cre- 

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

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

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

 l°-.3^ high. 



§ 2. Athyrium, Roth. — Indusium thin, attached to the upper side of the 

 vein; or recurved and crossing the vein, attached to both sides of it, thus 

 hecnminq rrniform or shap/d like a horseshoe. 

 IG A. Filix-fOBmina, Bcriih. Fronds ample, ovate-oblong; pinna? lan- 

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

 incised ; fruit-dots short, at length confluent. (Asj)idium F'ilix-fa?mina, 

 Swartz t) — Low shady woods, Florida to Mississippi, and nortiiward. — 

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

 in having a creei)ing caudex. 



14. SCOLOPENDRIUM, L. Hart's Tongue. 



Sori as in Asplenium, but tlie 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-o))long, acute, slightly serrulate, cordate at the base, 

 6' -9' long, the upper half fruit-l)earing. — Shadetl rocks, Tennessee, and 

 northward. 



