FiLTCEs. (ferns.) 659 



4. CHEILANTHES, Swartz. Lip-Fern. (PI. 16.) 



Sporangia borne on tho tliickcnuU ends of free vcink'ts, forming small and 

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

 whitisli and membranaceous, sometimes herbaceous, common indusium, formed 

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

 with 2-3-pinnatc and hairy or chatty fronds, the sterile and fertile nearly alike, 

 the divisions not halved, the principal vein central. Some species with con- 

 tinuous indusium connect this genus very closely with the next. (Name com- 

 posed of ;(fiXor, a Up, and tivOoi, flower, from the shape of the involucre.) 



1. C. vestita, Swartz. Fronds (6' - 15' high), lanceolate-oblong, hirsute, 

 as are the brown and shining stipes, with straiylitiali jiroininent/i/ articulated rusti/ 

 hairs, twice pinnate; pinnae rather distant, triangular-ovate; pinnules oblong, 

 crowded (2" -4" long), more or less incised, the ends of the roundish or ohlontjlohs 

 refli-xed and formin<j separate herbaceous involucres, which are pushed back by the . 

 ripened sporangia. (Nephrbdium lanbsum, Michx. !) — Clefts of rocks. Island 

 of New York ( W. W. Denslow), and New Jersey to Illinois, and southward. 



2. C. tomentosa, Link. Fronds (12' - 20' high) lanceolate-oblong, densely 

 tomentose with slender and entamjled ichitish ohscunlij articulated hairs, thrice pin- 

 nate ; primary and secondary pinnas oblong or ovate-oblong ; pinnules distinct, 

 minute (^"-1" long), roundish-obovatc, sessile or adnate-decurrent, the upper 

 surface less wooll)', the. reflexed narrow margin fi)rmin(j a continuous somewhat mem- 

 branaceous involucre. — Mountains of Virginia 7 and Kentucky ; thence westward 

 and southward. — Stipe and rhachis rather stout, brown, covered with narrow 

 chaffy scales and whitish hairs. 



3. C, lanugin6sa, Nutt. (in herb. Hook. & Sp. Fil. 1851). Stipes slen- 

 der, at lirst hairy, black or brown, shining ; fronds (3' -6' high) ovate-lanceolate, 

 woolly with soft ichitish distlnctli/ articulated flattened haiis, becoming smoother 

 above, twice or thrice pinnate; pinnaj (5"- 6" long) ovate, the lowest distant, 

 the others contiguous; pinnules en natelij pinnatifld, or mostly divided into minute 

 and roundish densely crowded segments (i"-!" long), the herbaceous niarfln re- 

 curved flyrming an almost continuous involucre. ( C. vestita, Hook. C. lanosa, Eaton, 

 Moore, excl. syn. C- gracilis, Mettenins, 1859. Myridpteris gracilis. Fe'e. ) — In 

 dense tufts, on dry rocks and cliffs, Wisconsin (7". J. Hale], Iowa ( Vasey), Mis- 

 souri (Nuttull, Engelmann), thence westward and southward. 



5. PELLJEA, Link. Clifi-Bk.vkk. (PI. 15.) 



Sporangia in roundish or elongated clusters on the upper part of the free 

 veins, distinct or confluent laterally so as to imitate the marginal continuous 

 line of fructification of Ptcris, commonly covered by a broad membranaceous and 

 continuous (rarely interrupted) general indusium, wliicii consists of the reflexed 

 and altered margin of the fertile pinnule or division. Small Ferns, with 1 - 

 3-pinnate fronds, the fertile ones with narrower divisions than the sterile, but 

 otherwise similar. Stipes generally dark-colored, smooth and shining. (Name 

 from TreXXdf, dnskfi, alluding to the stipe.) 



1. P. gracilis, Hook. Fronds smooth (3'-6' high), f/e//c«^e/y membrana- 

 ceous and slender, of few pinnas, the lower ones once "or twice pinnately parted 



