623 
filices. (ferns.) 
S'des ( 6 '-]0' high); the divisions linear-oblong, obtuse, minutely 
and obscurely toothed. — Rocks, common. July. 
i*»csinsim, VVilld. Fronds oblong, pale (2'-5' lon») 
he lower surface and the stalk scurfy-scaly; the divisions oblonv- 
linear. _ Rocks and on the trunks of trees. S. Ohio and southward 
* 1-VinnaUfd, triangular, annual: fruil-dols minute. 
f , ' 1 hc S6l>t«rtS, L. Stalk sparingly chaffy and downy; 
Jrond triangular in outline, longer than broad (3'-6'long) hairy on 
the veins; pinme linear-lanceolate, closely approximated, the lowest 
pa r deflexed and standing forwards ; their divisions linear-oblong, 
obtuse entire, each bearing about 4 fruit-dots towards the base and 
near the margin. (P connectile, Michx ) - Damp woods, common 
northward. July. — Rootstocks slender, blackish. 
, f ,. P ; .hexagondpterum, iviichx. Stalk smooth; frond 
broadly triang.dar, the base (6'-!)' broad) usually exceeding the lenuth • 
pinme rather distant, the lower of the lanceolate obtuse divisions toothed 
decurrent and forming a conspicuous wing to the rachis. —Rather 
open woods, common southward. —Smoother and larger than the last. 
* * * Fronds temate , the primary divisions twice-pinnate. 
fronl * L ' St3,k s,ender and brittle, smooth; 
frond smooth (pale light-green, 4'-& wide); the 3 principal divisions 
widely spreading, the ultimate ones oblong, obtuse, nearly entire • 
fruit-dots marginal, finally in contact. — Var. calcAreum (P. calca- 
reum, Smith) is more rigid, and minutely glandular-mealy on the 
rachis and midribs.— Deep rocky woods, common northward. July. 
2. STBIFTHIOPTERIS, Willd. Ostrich-Fern. 
Fruit-dots essentially as in Polypodium, but on a separate con¬ 
tracted frond, crowded together and soon confluent so as to occupy 
the whole lower surface of its narrowly linear pinnatifid pinnae, 
the margins of which are rolled backward so as to form a sort of 
general involucre, and to become somewhat necklace-shaped- 
there arc 5 pinnate free veins in each lobe, each fruit-bearing lat- 
erally the stalks of the sporangia united below, forming an ele¬ 
vated brush-like receptacle.— Sterile fronds large (2°-3°high) 
very much exceeding the fertile, pinnate, the many pinna; deeply 
pinnatifid, all growing in a close circular tuft from thick and scaly 
matted rootstocks. Stalks stout, angular. (Name compounded 
ot trrpovOos, an ostrich, and nrcpU, a fern, from the plume-like 
arrangement of the divisions of the fertile frond.) 
}' ^ er| Wlllica, Willd. (3. Pennsylvania, Willd. Os- 
mun a truthiopteris, L .)—Alluvial soil, not rare northward. Aug. 
