FILICES. (ferns.) GC5 



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

 connected by a very narrow winy, oblong, acute, inciscly serrate or pinnatifid 

 with spinulosely-toothed lobes ; indusium smooth and without marginal (/lands. 

 (A. spinulosum, elevatum, Broun. Lastrea spinulosa, Presl., Moore.) — In dam]) 

 woods, Penn Yan, New York, Sarttvell ; 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 ; pinnce 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. dilatatum. 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. Boottii. 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, Tuckenn. Dryopteris rigida, Ed. 1; not A. rigidum, Swartz.) — 

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

 dissected form, closely allied to the European A. remotum, Braun, and inter- 

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

 into the former. 



*-•*—*- Large (2° -4° high) : fronds once pinnate, and the pinna, deeply pinnatifid, 

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

 thinnish and fat, 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 jxtirs) 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. ClintOUianum. Frond in every way much larger (2j°-4° long); 

 pinna oblong-lanceolate, broadest at base (4' -6' long, 1' -2' broad), deeply pin- 

 natifid ; the divisions (8-1G 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- 

 tum, and often mistaken for A. Goldianum. 



