592 FILICES. (terns.) 



rise to new plants. (Asplenium rhi/.ophyllum, L.) — Shaded rocks on the 

 mountains of Georgia, and northward. — Fronds 4'- 10' long. 



11. ASPLENIUM, L. 



Fruit-dots ohlong or linear, ohlique to the midrib, the indusium attached by- 

 one margin to the mostly free veins, rarely curved, or double and attached to 

 both sides of the vein. 



§ 1 . ASPLENIUM Proper. — Indusia straight, attached by their whole length 



to the upper side of the vein; rarely some of them double, and placed kxck to back. 



* Fronds pinnatijid or simply pinnate. 



1. A. pinnatifidum, Nutt. Fronds lanceolate, acuminate, cordate at 

 the base, pinnatifid, or below sometimes pinnate, the roundish divisions obtuse, 

 crenate or serrate ; fruit-dots scattered. — Alleghanics of Alabama, and north- 

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

 elongated horizontally and acuminate, has been found in Alabama by Mr. Beau- 

 mont. 



2. A. dentatum, L. Fronds linear-oblong, obtuse, pinnate ; pinna? 

 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, cre- 

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

 the rachis often double. — Carolina, Th. ^foore, Florida, Binney. — Fertile fronds 

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



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

 shining ; fronds many from the short rootstock, linear, pinnate ; pinnae 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 Alleghanics, and northward. — Fronds 4'- 

 8' high. 



4. A. ebeneum, Aiton. Stipe and rachis purplish black and shining ; 

 fronds Linear-lanceolate or spatulate, acuminate, pinnate ; pinna numerous, ses- 

 sile, linear-oblong, auricled on one or both sides of the base, senate or nearly 

 entire, those below the middle of the frond gradually shorter and deflexed ; fruit- 

 dots 10-13 on a pinna. — Florida to Mississippi, and northward. — Fronds 6'- 

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



5. A. angUStifolilim, Michx. Fronds tall, lanceolate, pinnate ; pinna 

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

 rower, and bearing 60-80 curved lVuit-dots on the upper branches of the pin- 

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

 mountains, and northward. — Fronds l°-3° high, annual. Pinna- 2'-4' long, 

 4" -8" wide. 



* * Fronds 1-3-pinnatc or pinnat if d. 



6. A. moiltanum, Willd. Fronds small, ovate-lanceolate, pinnate; pin- 

 rue few, pctiolcd. ovate or triangular; the lower ones pinnatitid ; the tipper ones 

 Incised | divisions toothed or serrate; fruit-dots very short, the basal ones often 



