Woopsta. CLXIV. FILICES. 631 
in outline, with 8—12 pairs of roundish, sessile leaflets, 3—4” long. Fruit in 
several linear-oblong, finally roundish sori on each leaflet, placed oblique to the 
midvein. July. 
5. A. THELIPTEROIDES. Michx. Silvery Spleenwort. 
Frond bipinnatifid ; /fts. pinnatifid, oblong-lanceolate, acuminate ; ségments 
oblong, obtuse, serrate-crenate; sorz in parallel, oblique lines.—A fine, large 
fern, on shady banks of streams. Fronds 143—3f high, of an ovate-acuminate 
outline, on a slightly chaffy, pale stipe. Leaflets distinct and rather remote, 
narrow, 4—6’ long. Segments rounded atthe end, near }/long. Sori arranged 
in 2 rows on each segment, one on each side the midvein, convergent below, 
with shining, silvery indusia when young. July. 
6. A. Finrx-r@mina. Bernh. (Aspidium Filix-feemina and asplenoides. Sw. 
A. angustum. W.)—Frrond bipinnate ; /fis. lanceolate, acuminate ; seg. ob- 
long-lanceolate, deeply cut-pinnatifid ; ultimate seg. 2—3-toothed ; sori reniform 
or lunate, arranged near the veins; sézpe smooth.—A delicate, finely-divided fern 
in moist woods. Fronds 1—2f high, with subopposite divisions, These are sub- 
divided into distinct, obtuse segments, which are themselves cut into oblong, deep 
serratures, and lastly, the serratures are mostly with 2—3 teeth at the summit. 
Sori large, at first in linear curves, finally confluent, giving the whole frond a 
dark brown hue. July. 
7. A. Ruta-muraria. Wall-rue Spleenwort. . 
_ Frond bipinnate at base, simply pinnate above; /fts. small, petiolate, cu- 
neate, obtusely dentate above.—An extremely small and delicate fern, in dry, 
rocky places. Frond 2—3’ high, 4 as wide, smooth, growing in tufts, somewhat 
coriaceous. Segments usually 3 on each leaflet, less than 4’ long. Stipe flat 
and smooth. Sori linear-oblong, slightly oblique, of a rusty-brown color, finally 
‘confluent. July. 
8. A. montainum. Willd. (A. Adiantum-nigrum. Michz.) 
Frond glabrous, bipinnate ; /fts. oblong-ovate, pinnatifid ; seg. 2—3-toothed 
at the apex; sovz linear, finally confluent——Mountain rocks, Bethlehem, Penn. 
Schwenitz (fide Beck), S. to Car., W.to Ky. Fronds growing in tufts, 4—8’ 
high, narrowly oblong-lanceolate in outline, mostly bipinnate, but more or less 
divided according to the size. Segments more obtuse than in the foreign A. 
Adiantum-nigrum. July. 
4,.WOODSIA. Brown. 
In honor of Joseph Woods, an excellent English botanist. 
Sori roundish, scattered ; indusium beneath the sorus, open, with 
a eee or fringed margin, including the pedicellate thece, like a 
calyx. 3 
1. W. ILvensis. Br. (Polypodium. Willd.) ? 
Frond pinnate, leaflets pinnatifid, lanceolate; segments ovate-oblong, ob- 
tuse ; sori near the margin, at length confluent ; rachis and stipe chaffy—Grow- 
ing in tufts,on rocks and in dry woods. Fronds 5 or 6’ high, on chaffy and 
woolly stipes, most chaffy at base. Foliage 3 or 4’ long, } as wide, oblong- 
lanceolate in outline, woolly or chaffy beneath, with opposite and alternate leat- 
lets about an inch in length. The lower leaflets are pinnatifid, upper ones 
wavy on the margin or entire. June. 
2. W. Perrinidna. Hook. & Grev. (Hypopeltis obtusa. Tur.) 
Frond subbipinnate, minutely glandular-pilose ; segments of the leaflets pin- 
natifid ; wtimate segments roundish-oblong, obtuse, bidentate ; sori submarginal: 
stipe somewhat chaffy.— About a foot high, among and on rocks. Fronds lance 
oblong in outline, 3 times as long as wide. Segments of the leaflets crenate- 
serrate, the lower ones distinct, upper confluent. Sori orbicular, becoming 
nearly confluent, each subtended by a half round indusium notched into little 
teeth on the margin. July. 
3. W. HyperRBorEA. Br. (Polypodium. Willd.) Flower-cup Fern. 
Frond pinnate ; /fts. suborbicular, subcordate, 3-parted or incisely pinnati- 
fid, cuneate at base, rough pilose beneath.—A very small species, much resem- 
