PiLiCES. (feuns.) 687 



"2. A. Noveboracense, Swartz. Fronds pinnate, lanceolate in outline, 

 lapering both icaijs from the middle; pinnaj lanceolate, ^//e lowest 2 or viore 

 pairs r/radualli/ shorter and dejiexed ; lobes flat, oblong, basal ones often en- 

 larged and incised; veins simple, ov iov'kQd hi the basal lobes; fruit-dots dis- 

 tinct, near the margin ; indusium minute, the margin glanduliferous. — Swamps 

 and moist thickets ; common. July. — Frond pale green, delicate and mem- 

 branaceous, hairy beneath along the midribs and veins. 



* * Veins, at least the lowest, more than once forked or somewhat pinnateli/ 

 hranchinc] ; fruit-hearing veinlets often obscure or vanishing above the fruit- 

 dot ; fronds, at least the sterile ones, often evergreen ; stalks and apex oj 

 the thickened rootstock scaly or chaffij, and often the main rhachis also. 

 't-I^onds small, pinnate ; pinnce pinnatifid ; indusia very large, persistent. 



3. A. fragrans, Swartz. Fronds (4-12' high) glandular and aromatic, 

 narrowly lanceolate, with linear-oblong pinnately -parted pinnie ; their crowded 

 divisions (2" long) oblong, obtuse, toothed or nearly entire, nearly covered be- 

 neath with the very large thin imbricated indusia, which are orbicular with a 

 narrow sinus, the margin sparingly glanduliferous and often ragged. — On 

 rocks, especially near waterfalls, mountains of northern New Eng., west and 

 northward. — Kootstock stout, nearly erect, densely chaffy, as are the crowded 

 stipes and rhachis. (Asia, and barely reaching S. E. Eu.) 



•«- -I- Large (1 -2^° ^^ig^), the fronds mostly twice pinnate icith variously toothed 

 and incised pinnules ; indusia rather small, shrivelled in age, or deciduous. 



4. A. Spinulosum, Swartz. Stipes with a few pale-broicn deciduous 

 scales; frond ovate-lanceolate, twice ipinnate ; pinrice oblique to the rhachis, 

 elongated -triangular, the lower pairs broadly triangular ; pinnules set obliquely 

 on the midribs, connected by a very narrow wing, oblong, acute, incisely ser- 

 rate or pinnatifid with spinulosely-toothed lobes; indusium smooth and ivithout 

 marginal glands. — In damp woods, New Eng. to Ky., and northward. July. 



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



Var. interraddium, I). C. Eaton. Scales of the stipe few, bi-oicn with 

 a darker centre ; frond broadly oblong-ovate, twice or often thrice pinnate ; 

 ptnnce spreading, oblong-lanceolate, t\vQ lower unequally triangular-ovate ; pin- 

 nules 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. — Woods, everywhere. 



Var. dilatatum, Hook. Scales of the stipe large, broicn with a dark cen- 

 tre; frond broader, ovate or triangular-ovate in outline, oftenest thrice pinnate; 

 pinnules lance-oblong, the lowest often mucli elongated ; indusium (in the 

 North American plant) smooth and naked. — A dwarf state, fruiting when 

 only 5-8' high, answers to var. dumetorum. — N. New Eng, to Minn., chiefly 

 in mountain woods, and northward. (Eu.) 



5. A. Boottii, Tuckerman. Scales oi the stipe pale-brown : fronds (1-2|° 

 long) elongated-lanceolate in outline, somewhat narrowed at base ; lowest pin- 

 Uic triangular-ovate, the upper longer and narrower; pinnules oblong-ovate, 

 sharply spinulose-serrate or the lower pinnatifid ; indusium minutely glandular. 

 (A. spinulosum, var. Boottii, of last ed. A. cristatum, var. uliginosum, Milde.) 



— Wet thickets and about ponds, New Eng. to Del. and Minn. July. — Ster- 

 ile fronds much smaller and simpler than the fertile. (Eu.) 



