FiLiCEs. (ferns.) GG5 



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

 eoiinected by a vei'v narrow wing-, oblong, acute, ineisely serrate or jjinnatilid 

 with s])inulosely-toothed lobes ; iinlusium smooth and without iiiarijiual (jknids. 

 (A. spiuulosum, genuinum, Milde. Lastrea spinulosa, PresL, Moore.) — In damp 

 woods, Penu Yan, New York, Sarlwtll ; Vermont, Frost; and probably north- 

 ward. July. — The eouiniou European type, rare in North Amcriea. (Eu.) 



Var. intermedium. S-ales of the stipe few, brown with a darker centre; 

 frond broadly oblony-ovate, twice or often thrice pinnate ; pinnK spreading, ob- 

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

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

 at the apex ; margin of the indusiuin denticulate and besit with niiim'.e stalkeil g/ondx. 

 (A. intermedium, WUld. Dryopteris intermedia, £(/. I.) — Woods, everywhere. 



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

 broader, ovule or triaiigidar-ocate 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, Swarlz. A. campyldptcrum, /viwre.) 



— 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 ; fond elungaled-oblong or elun- 

 gated-lanceolate in outline; ])in)iulcs broadly oblong, very obtuse, the lower pin- 

 iiatifid, the upper and smaller merely serrate; indusium minuleli/ glandular. 

 (A. Boottii, 7'uckerm. 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. spinulosura and A. cristatum, but passing 

 into the former. 

 H- •!-■»- Large (2° -4° high) : fronds once pinnate, and the jnnna' deeply pinnntijjd, 



or nearig twice pinnate: fruit-dots not verg near the margin; the indusia large, 



thinni.^h 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 pairs) oblong, very obtuse, finely serrate or cut-toothed, the lowest 

 jiinnatifid-lobed ;//•«/< -(/o/s as near the midvein as the margin ; indusium round-reni- 

 forni, the sinus mostly shallow, smooth and naked. (A. Lancastrie'nse, Spreng.) 



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

 bearing broad and deciduous chaffy scales. (Eu.) 



Var. Clintonianura. Frond in everg wag much larger (2|^°-4° long) ; 

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

 natifid ; the divisions (8-lG pairs) crowded or distant, Unear-ohlong, obtuse, 

 obscurely serrate or cut-toothed, the basal ones sometimes jjinnately 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. 

 L & M— 48 



