422 ORDER 159. FILICES. 



1 P. aquilina L. Common Brake. Frond 3-parted, branches bipinnate, segment! 



oblong, obtuse, the terminal often elongated. Abundant everywhere. 3 6f. 

 ft. raut'tita. The terminal segment linear-oblong. Common South. 



2 P. <'retic-a L. Pale-bright-green, 1 IJf, smooth; p:nnae lin. -lanceolate, the lower 



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

 ft. albi-linrata. Pinnae white-banded in the midst aiong the mid-vein. 



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



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



ft. CISISTATA. Each segment expardr J ut r.pr.x into a fan-shaped blade. 

 f P. QUAURIAITRITA. Frond ample, ovt.tr, 1 Of! smooth; pinnae distinct, pinnatifld, 

 lobes contiguous, oblong, obtuse, with the forked veins conspicuous, .'imaica. 

 ft. ARGYKIA. Pinnae whitened Ir. the midst along the mid-vein. 



5 P. loiigllolla L. Tall, 2 Of r'gM; pinnae lance-linear petiolulate. obliquely trun 



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



6 P. PEUATA. Bright greeii, 4- -0'. Frond 3-parted, as broad as long; lateral pinnae 2- 



parted, all deeply lobed, s/rl In a broad band all around. From the W. Indies. 



7 P. gracllis Ms. Delicsc';, smooth and shining, 46' ; fronds lanceolate, the sterile 



bipinnatifld, fertile bipin;.Lte with narrow segments. Rocl.s, Vt., and W. 



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



or pinnate ; segments oj posite, oblong, margins com-picuourlj revolute, with edges 



often meeting behind, as in Allosorus, 3 6 12'. Ou lime rocks, N. and 8. 



ft. *ilabaiti(niii* (Buc dey). Taller (10 200, bipin. below, some pn. t-auriculate. S. 

 ft P. ROTUNDiroLiA. Stipe, rachis, and chaffy hairs purple. 1 IJf ; frond narrow, sim 



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

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



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

 IIP. HAST ATA. Frond bipinnate, 12 18' ; pinnae cordate-hastate ; segments ovaJe, the 



terminal ones much larger, oblong or hastate, or 3-lobed. Varies much. From 8. 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. 



1C. vestita Sw. Indusia separate, the retiexed, 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 eegrn. ; fronds tripinnate, lance-oblong, rusty, 12 18'. 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 Nos. 1 1 



* Fronds pinnately divided 2 4 times ; segments subequilateral Nos. 5 S 



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



1 A. pedatnm 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. 814'. Damp, rocky woods. Our most elegant natfe Fern. 



2 A. PUBESCENS. Stipe rough-pubescent; pn. 5 7, irregularly pedate. hispid beneath 



O'long; segments oblong, (i 8". contiguous : sori round, crowded. N. Hoi. II 



