FILTCES. (FERNS.) 665 



gular, the lower pairs broadly triangular ; pinnules set obliquely on the midribs, 

 connected by a very narrow wing, oblong, acute, incisely serrate or pinnatifid 

 with spinulosely-toothed lobes; indusium smooth and without marginal glands. 

 (A. spinulosum, genuinum, Milde. Lastrea spinulosa, Presl., Moore.) In damp 

 woods, Penn Yan, New York, Sartwdl; Vermont, Frost; and probably north- 

 ward. July. The common European type, rare in North America. (Eu.) 



Var. intermedium. Scales of the stipe few, brown with a darker centre; 

 frond broadly oblong-ovate, twice or often thrice pinnate ; pinnae, spreading, ob- 

 long-lanceolate, the lower ones unequally triangular-ovate; pinnules crowded, 

 ovate-oblong, spreading, pinnately divided ; the oblong lobes spinulose-toothed 

 at the apex ; margin of the indusium denticulate and beset with minute stalked glands. 

 (A. intermedium, Willd. Dryopteris intermedia, Ed. 1.) Woods, everywhere. 



Var. dilattum. Scales of the stipe large, brown with a dark centre ; frond 

 broader, ovate or triangular-ovate in outline, oftenest thrice pinnate ; pinnules lance- 

 oblong, the lowest ones often much elongated; indusium (in the North American- 

 plant) smooth and naked. (A. dilatatum, Swartz. A. campylopterum, Kunze.) 



A dwarf state, fruiting when only 5' - 8' high, answers to var. dumetorum. 

 N. New England to Wisconsin, chiefly in mountain woods, and northward. {Eu.) 



Var. Bo6ttii. Scales of the stipe pale-brown ; frond elongated-oblong or elon- 

 gated-lanceolate in outline ; pinnules broadly oblong, very obtuse, the lower pin- 

 natifid, the upper and smaller merely serrate; indusium minutely glandular. 

 (A. Boottii, Tuckerm. Dryopteris rigida, Ed. 1; not A. rigidum, Swartz.) 

 E. Massachusetts and Connecticut to New York, and northward. The least 

 dissected form, identical with A. cristatum, var. uliginosum, of Milde, and inter- 

 mediate in appearance between A. spinulosum and A. cristatum, but passing 

 into the former. 



H- -t-n- Large (2 -4 high) : fronds once pinnate, and the pinnce deeply pinnatifid, 

 or nearly twice pinnate : fruit-dots not very near the margin ; the indusia large, 

 thinnish and flat, persistent. 



5. A. cristatum, Swartz. Frond linear-oblong or lanceolate in outline (1- 

 2 long) ; pinnce short (2' -3' long), triangular-oblong, or the lowest nearly trian- 

 gular-ovate, from a somewhat heart-shaped base, acute, deeply pinnatifid ; the 

 divisions (6-10 pairs) oblong, very obtuse, finely serrate or cut-toothed, the lowest 

 pinnatifid-lobed ; fruit-dots as near the midvein as the margin ; indusium round-reni- 

 form, the sinus mostly shallow, smooth and naked. (A. Lancastriense, Spreng.) 



Swamps, &c. : common. July. Stipes and the stout creeping rootstock 

 bearing broad and deciduous chaffy scales. (Eu.) 



Var. Clintoninuin. Frond in every way much larger (2^ -4 long); 

 pinnce oblong-lanceolate, broadest at base (4' -6' long, l'-2' broad), deeply pin- 

 natifid; the divisions (8-16 pairs) crowded or distant, linear-oblong, obtuse, 

 obscurely serrate or cut-toothed, the basal ones sometimes pinnately lobed; 

 veins pinnately forking, the lowest anterior veinlets bearing the fruit-dots near the 

 midvein ; indusium orbicular with a shallow sinus, smooth and naked. Swampy 

 woods, New England to New Jersey, New York ( G. W. Clinton, &c. ), and west- 

 ward. July. Rootstock stout, creeping, chaffy (like the stipes) with large 

 bright-brown scales. A showy Fern, unlike any European form of A. crista- 

 4 turn, and often mistaken for A. Goldianura. 



