592 FiLiCES. (ferns.) 



rise to new plants. (Asplenium rhizophyllum, L.) — Shaded rocks on the 

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



11. ASPLENIUM, L. 



Fniit-dots oblong or linear, oMiciue 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 back to back: 



* Fronds pinmitijid or simply pinnate. 



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

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

 crenate or serrate ; fruit-dots scattered. — Alleghanies 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 ; pinnjc 

 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, ol)tuse; fruit-dots 6-8 on each ))inna, elongated, the one next 

 the rachis often double. — Carolina, Th. Moore, 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. mclano- 

 caulon, Willd.) — Rocks along the Alleghanies, and northward. — Fronds 4' - 

 8' high. 



4. A. Gbeneum, Alton. Stipe and rachis purplish black and shining ; 

 fronds linear-lanceolate or spatulatc, acuminate, pinnate ; iiiuiiai numerous, ses- 

 sile, linear-oblong, auricled on one or both sides of tiie base, serrate or nearly 

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

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

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



5. A. angustifoliura, Midi.x. Fronds tall, lanceolate, piunatc ; pintuc 

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

 rower, and bearing GO - 80 curved fruit-dots on tlic upper branches of the i)in- 

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

 mountains, and northward. — Fronds 1° -3° high, annual. Pinna; 2'-4'long, 

 4" -8" wide. 



* * Fronds 2 - H-pinnnte or pinnatijid. 



6. A. montanum, Willd. Fronds small, ovate-lanceolate, piimate ; pin- 

 na; few, jK'tioled, ovate or triangular; the lower ones piniiatilid ; the n])p('r ones 

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



