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 Sw. 



Kock -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. LIP-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 straw-colored. 3. 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. C. Fed. 



Leaf-blades 15-45 cm. long; petioles stout, densely brown-tomentose. 6. C. tcnnentosa. 



Leaf-blades scaly and tomentose beneath, white-tomentose above. 7. C. Lindheimeri. 



1. Cheilanthes Alabamensis (Buckl.) Kunze. Rootstocks horizontal, stout, with 

 brown scales. Petioles black, 7-18 cm. long, wiry, rusty -villous at least below; leaf-bladfes 

 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. Kootstocks 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 leucopoda 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 Canon, Texas. Also in Mexico. 



4. Cheilanthes lanosa (Michx.) Watt. Rootstocks with pale rusty -brown scales. 

 Petioles tufted, wiry, chestnut-brown, 5-10 cm. 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. [(7. vestita Sw.] 



On rocks, Connecticut to Missouri, middle Georgia and Texas. 



5. Cheilanthes Feei 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 petioles, 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. 



6. Cheilanthes tomentosa 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 cm. long, black-brown, covered with scales and wool when young ; leaf-blades ovate- 



