FiLiCES. (ferns.) G81 



liasc; involucres lunulate or trausvcrsely oblong. — Moist rocky places, \'a. 

 to Mo., and southward. (Ku.) 



4. PTJE3RIS, L. BnAKK or BuACKEN. (PI. 17.) 



Sporangia in a continuous slfMidor line of fructification, occupying the entire 

 margin of the fertile frond, and covore*! by its reHexed narrow edge which 

 forms a continuous memI)ranaceous indusium, attached to an uninterrupted 

 transverse vein-like receptacle connecting the tips of the forked free veins. — 

 Fronds l-3-])innate or decompound. (The ancient Greek name of Ferns, 

 from irnpov, a n-imj, on account of the prevalent pinnate or featliery fronds.) 



1. P. aquilina, L. (Com.mon liKAKK.) Frond dull green (2-3° wide), 

 ternate at the summit of an erect stout stalk (I -2"^ High), the widely spread- 

 ing branches twice pinnate; pinnules oblong-lanceolate ; the upper undivided ; 

 the lower more or less pinnatifid, with oblong obtuse lobes, margined all round 

 with the indusium, which is really double in this species. — Var. caudXta, 

 with the lobes very narrow and revolute, the terminal ones much elongated, 

 is a southern form, which extends in a modified condition as far north as >»ew 

 Jersey. — Thickets and hillsides, common. Aug. (Eu.) 



5. CHEILANTHES, Swartz. Lip-Fern. (PI. 17.) 



Sporangia borne on the thickened ends of free veinlets, forming small and 

 roundish distinct or nearly contiguous marginal fruit-dots, covered by a mostly 

 whitish and membranaceous, sometimes herbaceous, common indusium, formed 

 of the reflexed margin of separate lobes or of the whole pinnule. — Low, mostly 

 with 2-3-pinnate and hairy or chaffy, rarely smooth fronds, the sterile and 

 fertile nearly alike, the divisions with the principal vein central. Some spe- 

 cies with continuous indusium connect this genus very closely with the next. 

 (Name composed of x^^^°^^ " ^^Pt ^^^ 6.vGos,Jiower, from the shape of the in- 

 dusium.) 



» Fronds smooth, or at most hairy. 



1. C. Alabam^nsis, Kunze. i^ronc^s smoof/*, chartaceous (2-8' long), 

 ovate-lanceolate, l)ipinnate; pinnae numerous, oblong-lanceolate ; pinnules tri- 

 angular-oblong, rather acute, often auriculate or lol)od ; indusium continuous, 

 rather broad , pale , and of Jirm consistence. — On rocks, mountains of Va. to 

 Ky., and southward. 



2. C. vestita, Swartz. (PI. 17, fig. 1, 2.) Fronds (6-15' high), lanceo- 

 late-ohlong, hirsute, as are the brown and shining stij)os, with straightish promi- 

 nenfli/ articxdated rusti/ hairs, twice pinnate ; pinna? rather distant, triangular- 

 ovate; pinnules oblong, crowded (2-4" long), more or less incised, the ends 

 of the roundish or oblong lobes reflexed and forming separate herlKiceous involucres, 

 which are pushed back by the ripened sporangia. — Clefts of rocks, Manhattan 

 Island ( W. W. Denslow) and N. J. to 111., and southward. 



* ♦ Fronds tvoolli/ or tomentose. 



3. C. tomentdsa, Link. Fronds ( 1 2-20' high) lanceolate-oblong, densely 

 tomentose with slender and entangled irhitish nbsrureli/ articulated hairs, thrice 

 pinnate; primary and secondary ])inn;c oblong or ovate-oblong; pinnules dis- 

 tinct, m'mnto (i-1" long), roundish-obovate, ses.sile or adnate-decurrent, the 

 upper surface less woolly, ^Ae reflexed narrow margin forming a continuous some- 



