FiLiCKs. (feuns.) C87 



2. A. Noveborac^nse, Swartz. Fronds pinnate, lanceolate in outline, 

 ta}>ering buth irai/s from the middle; pinuaj lanceolate, Me luuest 2 or more 

 jia lis gradually shorter and dcjlexed ; lol)es flat, oblong, basal ones often en- 

 larged and incised ; veins simple, ox ioTkcd\n the basal lobes; fruit-dots dis- 

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

 and moist thickets ; common. July. — Frond ])ale green, delicate and mem- 

 branaceous, hairy beneath along the midribs and veins. 



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

 branching ; fruit-bearing veinlets often obscure or vanishing above the fruit- 

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

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

 -t-Pi-onds small, pinnate ; pinna; pinnatifd ; indusia very large, persistent. 



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

 narrowly lanceolate, with linear-oblong pinnately-j)arted pinnae ; their crowded 

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

 neath with the very large thin iml)ricatcd indusia, whicli 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. — Rootstock stout, nearly erect, densely chaffy, as are the crowded 

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



•«- -»- Large (1 -2,\° high), the fronds mostly twice pinnate with varioushj toothed 

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



4. A. Spinul6suin, Swartz. Stipes with a few pale-brown deciduous 

 scales ; frond ovate-lanceolate, twice pinnate ; pinnce oblique to the rhachis, 

 elongated-triangular, the lower pairs broadly triangular ; pinnules sot obliquel7 

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

 rate or pinnatifid with spinulosely-toothed lobes; indusiuni smooth and without 

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



— The common Euro])can type, rare in North America. (Eu.) 



Var. intermedium, D. C. Eaton. Scales of the stipe few, brown with 

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

 pinnce spreading, oblong-lanceolate, the lower unequally triangular-ovate ; pin- 

 nules crowded, ovate-oblong, spreading, pinnately divided ; the oblong lobes 

 epinulose-tootlied at the apex ; margin of the indusiuin denticulate and beset 

 with minute stalked glands. — Woods, everywhere. 



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

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

 pinnules lance-oblong, the lowest often much 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. Bo6ttil, Tuckerman. Scales of the stipe pale-broicn : fronds (1-2^° 

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

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

 sharply spinulose-serrate ortlie 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 tliau the fertile. (Eu.) 



