422 OUDEU i:;0. FILICES. 



1 P. nq u Hi 11 a L. Common Brake. Frond 3-parted, branches bipinnatc, segmenti 



oblong, obtuse, tUe terminal often elongated. Abundant everywhere. 2 6f. 

 . emulate. The terminal segment linear-oblong. Common South. 



2 P. Cr^tica L. rale-bright-green, 1 IK, smooth; pinnoe lin. -lanceolate, the lowei 



ones 2-parted and petiolulate, serrulate; fertile louger, linear. Fla. Cultivated. 

 /3. ftlbi-ltneata* Pinnae white-banded in the midst along the mid-vein. 



3 P. SERRULATA. Bright green, 1 l^f ; pinnae long-linear, decurrent on the rachis, ex- 



cept the lowest pair, which are 2- or 3-parted and short-stalked. China. 

 /3. CRISTATA. Each segment expardc J ut cpex into a fan-shaped blade. 



4 P. QUAURIAURITA. Frond ample, ov-c.tr, 1 C,f! smooth; pinnis distinct, pinnatifld, 



lobes contiguous, oblong, obtuso, tv'ch the forked veins conspicuous. Jamaica. 

 /3. AROYRIA. Pinnae whitened ir the ;n?dst along the mid-vein. 



5 P. longifolia L. Tall, 2 Of r'g'J; pinnae lance-linear petiolulate, obliquely trun- 



cate at base ; stipe, rachis, ad -^Li-veins chaffy-hairy. Fla., and cultivated. 



6 P. PEDATA. Bright green, 4--V. frond 3-parted, as broad as long; lateral pinnae 2- 



parted, all deeply lobed, sorl \n a broad band all around. From the W. Indies. 



7 P. gracilis MX. DelicFf), smooth and shining, 46' ; fronds lanceolate, the sterile 



bipinnatifid, fertile bipm;t.te with narrow segments. RocLs, Vt., and W. 



8 P. atropurpurea L. Eock Brake. Coriaceous; racb.is hairy ; lower pn. ternate 



or pinnate ; segments oj posite, oblong, margins coiu>picnou*l) revolute, with edges 

 often meeting behind, as in Allosorus, 3612'. Ou lime rocks, N. and S. 

 ft. *llaban.tn*1* (Buc dey). Taller (10 2(X), bipin. below, some pn. f-auriculate. S. 



9 P. ROTUNDIFOLIA. Stipe, rachis, and chaffy hairs purple, 1 l|f ; frond narrow, sim 



ply pinnate ; segments small, round or oval, alternate. From New Zealand. 



10 P. TREMULA. Bright gryen, 2 3f, tripinnate ; pnl. or segments linear-oblong, ob- 

 tuse, serrulate, the lower ones again pinnatifld. From N. S. Wales. 



IIP. HASTATA. Frond bipinnate, 1218' ; pinnae cordate-hastate ; segments ovate, the 

 terminal ones much larger, oblong or hastate, or 3-lobed. Varies much. From S. Afr. 



20. CHEILANTHES, Swtz. LIP FEKN. Fronds small, mostly 2-3- 

 pirmate, chaffy or hairy, mid-vein central. Sori on the ends of the vein- 

 lets, distinct, or some confluent, covered by an interrupted or continuous 

 indusiuin from the edge of the frond. Stipes brown. Hardly distinct 

 from the preceding genus. 



1 C. vestlta S\v. Indusia separate, the rcflexed, unchanged tips of the ovate segm. ; 



fronds 512', bipinnate, lin. -oblong, hairy ; pn. crenately lobed. Rocks, M. and S., rare. 



2 C. tomeutosa Link. Indusia continuous, the membranous margin of the small, 



obtuse segm. ; fronds tripinnate, lance-oblong, rusty, 1218'. N. C., and W. 



21. ADIANTUM, L. MAIDEN-HAIR FERN. Sori oblong or round- 

 ish, marginal. Indusia membranaceous, formed from thereflexed margins 

 of distinct portions of the frond, and opening inwardly. Stipe ebony-black, 

 polished. Ultimate segments often dimidiate, the mid-vein on the lower 

 margin. A large and beautiful genus, much cultivated. 



* Fronds pedately divided, the divisions 1-3-pinnate ; segment? oblique Nos. 14 



* Fronds pinnately divided 2 4 timers ; segments subequilateral Nos>. 5 8 



* Fronds simply pinnate, with very large opposite oblique segments No. 9 



1 A. pedatuiii L. Very smooth ; branches of the regularly pedate frond pinnate; 



(segments rhombic-oblong, 1', toothed on the upper side, obtu?e at apex ; sori oblong- 

 humlate. 814'. Damp, rocky wood*. Our most elegant. naf."e Fern. 



2 A. PI-RKSCENS. Stipe rough-pubescent; pn. 57, irregularly pedate. hispid beneath. 



H9' long ; segments oblong, C 8", contiguous ; sori round, crowded. N. IIol. H 



