FiLicEs. (ferns.) 629 



* * Fronds pinnatijid or simply pinnate. 



2. A. pinnatifldum, Nutt. Fronds lanceolate, acuminate, cordate at 

 the base, piunatifid, ur below sometimes piimate, the roundish divisions ob- 

 tuse, crenate or serrate ; fruit-dots scattered. — Alleghanies of Alabama, and 

 northward. — Fronds 3' - 6' long. A form with the lowest segment on each 

 side elongated horizontally and acuminate has been found in Alabama by 

 Mr. Beaumont. 



3. A. dentatum, L. Fronds linear-oblong, obtuse, pinnate; pinnae 

 mostly opposite, 8-12 pairs on short but distinct stalks, roundish ovate (3"- 

 4" long), cuneate at the lower side of the base, and truncate at the upper side, 

 crenate or serrate, obtuse ; fruit-dots 6-8 on each pinna, elongated, the one 

 next the rachis often double. — Carolina (Th. Moore), Florida (Binneij). — 

 F^ertile fronds 4' -6' high, the stipe as long as the sterile fronds. 



4. A, Trichomanes, L. Stipe and rachis slender, purplish black and 

 shining ; fronds many from the short rootstock, linear, pinnate ; pinnje numer- 

 ous, minute (2" -3" long), roundish oblong, narrowed at the base and attached 

 to a raised point on the rachis; fruit-dots 4-8 on a pinna. (A. melano- 

 caulon, Willd.) — Rocks along the Alleghanies, and northward. — Fronds 

 4' -8' high. 



.^. A. ebeneum, Alton. Stipe and rachis purpli.sh black and shining ; 

 fronds linear-lanceolate or spatulate, acuminate, pinnate ; pinnas numerous, 

 sessile, linear-oblong, auricled on one or both sides of the base, serrate or 

 nearly entire, those below the middle^ of the frond gradually shorter and de- 

 flexed; fruit-dots 10-13 on a pinna. — Florida to Mississippi, and northward. 

 — Fronds 6' -18' high, l'-3' wide; stipe very short. 



6. A. ebenoides, R. R. Scott. Frond thin, broadly lanceolate, pinnate 

 below, pinnatitid above, long-atteimate and often rooting at the apex, 4'- 9' 

 long; pinnie lanceolate from a broader base, 3" -9" long. — Shady ravines, 

 Central Alabama, and northward. Rare. 



7. A. parvulum, Mart. & Galeotti. Frond rigid, lanceolate, pinnate, 

 2' -8' long; piuuas nearly opposite and sessile, oblong, entire or crenulate, 

 auricled on one or both sides at the base, 2" - 6" long ; sori half-way between 

 the margins and midrib. — Calcareous rocks, Florida to Tennessee. 



8. A. flrmum, Kunze. Rootstocks short ; frond ovate or oblong, pin- 

 nate, rather longer than the pale smooth stipe, 12' or less long ; pinna; (about 

 12) lanceolate or oblong, obtuse, serrate, the terminal one attenuate ; sori in 

 two rows. — Marion County, Florida (./. D. Smith). 



9. A. angustifolium, Michx. Fronds tall, lanceolate, pinnate ; pinnse 

 numerous ; the sterile ones lanceolate from a truncate base ; the fertile ones 

 narrower, and bearing 60 - 80 curved fruit-dots on the upper branches of the 

 pinnate forking veins; indusia thickish, strongly convex. — Rich soil along 

 the mountains. — Fronds l°-3° high, annual. Pinnaj 2' -4' long, 4" -8" 

 wide. 



* * * Fronds 2 - 3-pinnate or jiinnatifid. 



10. A. montanum, Willd. Fronds sninll, ovate-lancpolate, pinnate; 

 pinniB few, petioled, ovate or ti'inngular; tlie lower ones pinnatitid ; tlie njiper 



