10 POLYPODIACEAE 
and tertiary divisions ; blades ovate-oblong, 15-75 cm. long, 2-pinnate, primary divisions 
mostly alternate: leaflets roundish ovate or nearly cordate-ovate, 10-20 mm. long, smooth. 
On dry rocks, Texas to California. Also in Mexico. 
12. CHEILANTHES Sv. ` 
Rock-inhabiting ferns, often small, usually with pubescent foliage. Leaves various : 
blades much divided. Sori terminal on the veins, ultimately more or less confluent. In- 
dusium formed of the reflexed margins of the leaflets, roundish, sometimes more or less 
confluent. Sporanges often much concealed in the scales of tomentum. Lie-FERN. 
Indusium not continuous around the leaf-segments. 
Leaf-segments glabrous. 
Leaf-blades 2-pinnate ; lower leaflets not enlarged. 1. C. Alabamensis. 
Leaf-blades nearly or quite 3-pinnate ; lower leaflets enlarged. 2. C. microphylla. 
Leaf-segments pubescent and glandular, not tomentose. 
Leaf-blades deltoid-ovate ; petioles stra w-eolored, 8. C. leucopoda. 
Leaf-blades ovate-lanceolate; petioles brownish. 4. C. lanosa. 
Indusium continuous around the margins of the leaf-segments. 
Leaf-blades tomentose below, hairy above. 
Leaf-blades 5-10 cm. long; petioles slender, becoming nearly glabrous. 5. €. Feei. 
Leaf-blades 15-45 em. long; petioles stout, densely brown-tomentose. 6. C. tomentosa. 
Leaf-biades scaly and tomentose beneath, white-tomentose above. 7. C. Lindheimeri. 
1. Cheilanthes Alabaménsis (Buckl.) Kunze. Rootstocks horizontal, stout, with 
brown scales. Petioles black, 7-18 em. long, wiry, rusty-villous at least below; leaf-blades 
lanceolate, glabrous, 5-25 cm. long, 2-pinnate ; leaflets numerous, ovate-lanceolate, acu- 
minate, the lower usually smaller than those above, pinnatifid ; segments mostly acute, often 
auriculate on the upper side at the base: indusia pale, membranous, interrupted by the in- 
cising of the segments. 
On rocks, Virginia to Alabama, Arkansas and Arizona. Also in Mexico. 
2. Cheilanthes microphylla Sw.  Rootstocks with slender brown scales.  Petioles 
dark brown, glossy, rusty-pubescent on the upper side, 10-15 cm. long ; leaf-blades ovate- 
lanceolate, 10-25 cm. long, 2-pinnate; lower divisions larger and more deltoid than the 
upper; leaflets deeply incised or pinnatifid : indusium similar to the leaf-blade in texture, 
interrupted or nearly continuous. 
On shell heaps, Florida. Also in New Mexico and tropical America. 
3. Cheilanthes leucópoda Link.  Rootstocks stout. Petioles 8-25 cm. long, chaffy 
at the base; leaf-blades broadly deltoid-ovate, 5-8 cm. long, 4-pinnate at the base, gradu- 
ally simpler above, everywhere glandular-puberulent, lowest pair of pinnae inequilaterally 
deltoid, upper oblong ; leaflets short-stalked, the lobules strongly revolute when fertile. 
On rocks, Uvalde Cañon, Texas. Also in Mexico. 
„4. Cheilanthes lanósa (Michx.) Watt. Rootstocks with pale rusty-brown scales. 
Petioles tufted, wiry, chestnut-brown, 5-10 em. long, hirsute; leaf-blades evergreen, her- 
baceous, oblong-lanceolate, 10-22 cm. long, gradually attenuate to the apex, 2-pinnate ; 
leaflets somewhat distant, lanceolate-deltoid, acute, deeply pinnatifid or incised, more or 
less covered with almost bristly hairs and usually somewhat glandular: sori numerous, 
covered by the infolded ends of the rounded or oblong lobes. (C. vestita Sw. ] 
On rocks, Connecticut to Missouri, middle Georgia and Texas. 
_5. Cheilanthes Feèi Moore. Rootstocks with narrow brown scales lined with black. 
Petioles densely tufted, slender, at first covered with woolly hairs, at length nearly glabrous; 
leaf-blades about as long as the Joe ovate-lanceolate, 5-10 cm. long, 3-pinnate or 2- 
pinnate with the leaflets pinnatifid, the upper surface slightly tomentose, the lower densely 
matted with whitish brown woolly hairs; upper pinnae oblong-ovate, the lower deltoid, the 
lowest distant; leaflets or their lobes minute, the terminal ones slightly larger than the 
others, all roundish or obovate and much crowded : indusium narrow. 
On rocks, Minnesota to British Columbia, Illinois, Texas and Arizona. 
,9. Cheilanthes tomentósa Link.  Rootstocks densely chaffy with light brown scales. 
Petioles tufted, 1-2 dm. long, rather stout, densely brown-tomentose ; leaf-blades oblong- 
lanceolate, 3-pinnate, 1.5-4.5 dm. long, densely tomentose, especially beneath, with slender 
brownish white obscurely articulated hairs ; leaflets ovate-oblong or oblong-lanceolate, the 
ultimate division about 1 mm. long, the terminal ones sometimes twice as large as the 
others : indusium pale, membranous, continuous. 
On rocks, Virginia to Missouri, Georgia, Texas, Arizona and Mexico. 
7. Cheilanthes Lindheimeri Hook.  Rootstocks slender, chaffy. Petioles scattered, 
10-18 em. long, black-brown, covered with scales and wool when young ; leaf-blades ovate- 
