16 POLYPODIACEAE 
2. Dryopteris Noveboracénsis ( L.) A. Gray. Rootstocks slender, horizontal. Leaf- 
blades lanceolate, tapering both ways from the middle, 3-6 dm. long, membranous, long- 
acuminate, pinnate ; leaflets lanceolate, sessile, long-acuminate, deeply pinnatifid, ciliate 
and finely pubescent beneath, 3-7 cm. long, the two or more lower pairs gradually shorter 
and deflexed, commonly distant ; segments flat, oblong, obtuse, the basal ones often en- 
larged : veins simple, or those of the basal lobes forked ; sori not confluent, borne near 
the margin: indusia minute, reniform, delicate, glandular. 
In moist or swampy woods, Newfoundland to Ontario and Minnesota, south to Georgia, Alabama 
and Arkansas. 
3. Dryopteris Thelypteris (L.) A. Gray. Rootstocks slender. Leaf-blades lanceo- 
late or oblong-lanceolate, scarcely narrower at the base than at the middle, 3-8 dm. long, 
short-acuminate, membranous, pinnate ; leaflets linear-lanceolate, short-stalked or sessile, 
mostly horizontal, acuminate at the apex, nearly truncate at the base, 3-7 em. long, slightly 
pubescent beneath, deeply pinnatifid ; segments oblong, obtuse, or appearing acute from 
the strongly revolute margins: veins regularly once or twice forked: sori crowded, 10-12 
to each segment: indusia reniform, slightly glandular, or glabrous. 
In marshes, New Brunswick to Manitoba, south to Florida and Texas. Also in Europe and Asia. 
4. Dryopteris pàtens (Sw.) Kuntze. Rootstocks stout. Leaves several together ; 
blades ovate-oblong, 4-12 dm. long, softly pubescent beneath ; leaflets approximate, linear, 
acuminate, the broadest pair somewhat reflexed, all cleft three-fourths the way to the mid- 
rib; segments numerous, the basal ones longest: veinlets manifest, the lowest ones of 
adjacent segments often uniting: sori near the margins: indusia very pubescent. 
In sandy soil or on calcareous rocks, Georgia and Florida to California. 
5. Dryopteris cristata (L.) A. Gray.  Rootstocks densely chaffy. Leaves ever- 
green ; petioles of the sterile leaves 5-12 cm. long, those of the fertile 1.5-2.5 dm. long ; 
blades linear-oblong or lanceolate, acuminate, gradually and slightly narrowed to the 
base, rather firm, 3-8 dm. long, pinnate ; leaflets lanceolate or triangular-ovate, acumi- 
nate, deeply pinnatifid or the lower pinnate, the segments 6-10 pairs, serrate or incised : 
sori about midway between the margin and midrib: indusia thin, glabrous. 
In wet woods and swamps, Newfoundland to Manitoba, south to Kentucky and Arkansas. Also 
in Europe and Asia. 
6. Dryopteris Floridàna (Hook.) Kuntze. Leaves clustered ; petioles 15-25 cm. 
long, with few ovate scales ; blades lanceolate, 45-50 cm. long; leaflets various ; fertile 
contined to the upper half of the leaf-blade, narrowly lanceolate, cut nearly to the rachis 
into oblong segments ; sterile leaflets broader, shorter below, less deeply cut. 
In swamps, Georgia, Florida and Alabama. : 
7. Dryopteris Goldieàna (Hook.) A. Gray. Rootstocks chaffy. Petioles 2.5-4.5 
dm. long, chaffy at least below ; leaf-blades ovate, rather firm, 6-12 dm. long, glabrous or 
nearly so, dark-green above, pinnate or nearly 2-pinnate ; lower leaflets broadly lanceolate, 
widest at about the middle, 1.5-2.5 dm. long, parted into about 20 pairs of oblong-linear 
subfalcate segments which are serrate with appressed teeth: sori very near the midrib, 
close together but distinct, large: indusia orbicular, glabrous, persistent. 
In rich woods, New Brunswick to Minnesota, south to North Carolina and the Indian Territory. 
_ 8. Dryopteris marginalis (L.) A. Gray. Rootstocks ascending, with dark brown 
shining scales. Leaves evergreen; petioles 7-20 cm. long, chaffy below; blades ovate- 
oblong or ovate-lanceolate, rather leathery, 1.5-7.5 dm. long, 1-2-pinnate, acuminate at 
the apex, slightly narrowed at the base ; leaflets numerous, lanceolate, nearly sessile, gla- 
brous, 5-12.5 em. long, the lower broader and shorter than the middle ones, the upper 
pinnatifid, the lower pinnately parted into oblong obtuse entire dentate or pinnately lobed 
segments : sori distinct, close to the margin, covered by the glabrous indusia. 
In rocky woods, Prince Edward Island to Minnesota, south to Georgia, Alabama and Arkansas. 
9. Dryopteris spinulósa (Retz) Kuntze. Leaves tufted, evergreen ; petioles bearing 
scales with dark centers ; blades ovate-lanceolate, usually not narrowed below, 2-pinnate ; 
leaflets narrowly triangular or the lower pairs broadly triangular, the ultimate segments 
oblique, connected by a very narrow wing, with spinulose-toothed lobes : indusia glabrous. 
: In rich woods, Newfoundland to Alaska and Washington, south to Virginia and Michigan. Also 
in Europe and Asia. Summer.—Two forms represent the species in our vance : one, D. pimp inter- 
média (Muhl.) Underw., has oblong-ovate 2-3-pinnate leaf-blades and oblong-lanceolate spreading 
leaflets, the lowest unequally triangular-ovate: indusium beset with stalked glands. Its range extends 
southward to North Carolina and Missouri. The other variety, D. spinulosa dilatáta (Hoffm.) Underw.. 
bis Kern n: Es bee ag maha commonly 3-pinnate blades, lanceolate-oblong ultimate divi- 
MS often much elongated, and glabrous indusia, ranges as far sonth as Georgia, Tennessee 
_ 10. Dryopteris unita (L.) Kuntze. Leaves tufted ; petioles brownish, naked, about 
45 em. long ; blades 0.5-1 m. long, 12-20 em. wide; leaflets narrow, the lower ones not 
reduced, cleft 3 to 3 the way to the midrib ; segments acute : veins pinnate in the broad 
