4:22 ORDER 159. FILICES. 



1 P. aqnilina L. Common Brake. Frond 3-parted, branches bipinnate, segments 



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

 /3. cauiftita. The terminal segment linear-oblong. Common South. 



2 P. Cretica L. Pale-bright-green, lljf, smooth; pinnse lin.-lanceolate, the lowei 



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

 /3. albi-lineatn. Pinnse white-banded in the midst along the mid-vein. 



3 P. SEKRULATA. Bright green, 1 IJf ; pinnae long-linear, decurrent on the rachis, ex- 



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

 /3. CRISTATA. Each segment expardfd U c-prx into a fan-shaped blade. 



4 P. QUAIJRIAURITA. Frond ample, ovi.tr, l"J\ smooth; pinnoe distinct, pinnatifid, 



lobes contiguous, oblong, obtuso, w'ch the forked veins conspicuous. T amaica. 

 /3. ARGTKIA. Pinnoa whitened jr. the ;njdst along the mid-vein. 



5 P. loiigilolia L. Tall, 2 Of r'g'Jr pinnse lance-linear petiolulate, obliquely trun- 



cate at base ; stipe, rachis, .vl "aid-veins chaffy-hairy. Fla., and cultivated. 



6 P. PEDATA. Bright green, 4- -G'. Frond 3-parted, as broad as long; lateral pinnse 2- 



parted, all deeply lobed, sor i 'in a broad band all around. From the W. Indies. 



7 P. gracilis MX. Delicate, smooth and shining, 4 6' ; fronds lanceolate, the sterile 



bipinnatifld, fertile bipm;.f,te with narrow segments. RccLs, Vt., and W. 



8 P. atropurpurea L. Hock Brake. Coriaceous; rachis hairy; lower pn. ternate 



or pinnate ; segments oj posite, oblong, margins conspicuously revolute, with edges 

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

 |3. *llaba>ntn*i* (Buc dey). Taller (10200, bipin. below, some pn. i-auriculate. S. 



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



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



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

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



1 1 P. HASTATA. Frond bipinnate, 12 18' ; 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 FERN. Fronds small, mostly 2-3- 

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

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

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

 from the preceding genus. 



1 C. vestita Sw. Indusia separate. the reflexed, unchanged tips of the ovate segm. ; 



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



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



obtuse eegm. ; 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 the reflexed 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 ; segments oblique Noa. 14 



* Fronds pinnately divided 2 4 times ; segments subequilateral No*. 58 



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



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



segments rhombic-oblong, 1', toothed on the upper side, obtuse at apex ; sori oblong- 

 Innulate. 8 14'. Damp, rocky wood*. Our most elegant natl"e Fern. 



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



& 9' long ; segments oblong, G 8", contiguous ; sori round, crowded. N. Hoi. If. 



