Woodwardia, Asplenium 83 



\ 3.. LORIN3ERIA, Presl. Fronds dimorphou's, veins every- 

 where forming areoles. 



3. W. augustifolia,* Sm. Sterile frond with slender stipes 

 9' — 12' long, 6' — 8' broad, deltoid-ovate, with numerous oblong- 

 lanceolate sinuate pinnje ; rachis broadly winged ; fertile frond . 

 with an elongated, castaneous stem ; pinnae 3' — 4' long, narrowly 

 linear. Mass. to Fla. near the coast. III. 



XV. ASPLENIUM, L. Spleenwort. 

 Sori oblong or linear, oblique, separate ; indusium straight or 

 rarely curved, opening toward the midrib when single, sometimes 

 double. Veins free in all our species. 



\ I. EU ASPLENIUM. Veins free, simple, or branched; in- 

 dusium straight or slightly curved attached to the upper side of a 

 vein: 



* Fronds simple. 



1. A. serratum, L. Fronds growing in a crown from a short, 

 stout, erect rhizoma, ij°— 2j° long, 2' — 4' broad, simple, spatulate 

 or linear-oblanceolate, the margin crenulate or irregularly but 

 finely serrate, sub-coriaceous ; midrib prominent, keeled and often 

 blackish purple beneath; veins closely placed, free, once forked; 

 sori much elongated, following the veins of the upper half of the 

 frond from near the midrib half way to the margin ; indusia single, 

 the free edge entire. Fla. VI. 



** Fronds pinnatifid or pinnate below, tapering to a point. 



2. A. pinnatifidum,* Nutt. Stipes tufted, 2'^4' long; fronds 



3' — 6' long, 1' — lY broad, lanceolate, pinnatifid, or pinnate below, 



tapering to a slender prolongation above ; lobes roundish-ovate, 



or the lowest pair acuminate; sori numerous. Pa. to 111., Ky, and 



Ala. III. 



3 A. ebenoides,* R. R. Scott. Fronds 4' — 9' long, broadly 



lanceolate, pinnatifid, pinnate below; apex prolonged and slender; 

 divisions lanceolate from a broad base, the lower ones shorter; 

 stipes black and polished, as is the lower part of the midrib espe- 

 cially beneath. N. Y., Pa., Ct., Ala., Ky., 111. III. Rare. 

 *** Fronds once pinnate. 



'^Pinnce %' — J^' long, m,ostly blunt. 



XRachis chestnut-brown or blackish. 



4. A. ebeneum. Ait. Stipes tufted, 3' — 5' long, cbestnut- 

 brown, nearly naked ; fronds 8' — t6' long, linear-lanceolate ; 

 pinnae 20 — 40, lanceolate, subfalcate, or the lower oblong, %'—\' 

 long, the dilated base auricled on the upper or both sides ; sori 

 often 10 — 12 on each side. Canada to Fla., Ky. and northward. III. 



