1 2 POLYPODIACEAE 



and distinct, or confluent. Indusium formed of the reflexed usually modified margins, 

 sometimes continuous. Sporanges often obscured by the hairy or scaly covering. 

 Lip-Fern. 



Indusium not continuous around the leaf-segments. 

 Leaf-segments nearly or quite glabrous. 



Leaf-blades 2-pinnate; lower leaflets not enlarged. i. 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-ol^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, glabrate with age. 5. C. Feci. 



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

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



1. Cheilanthes Alabamensis (Buck!.) Kunze. Eootstocks horizontal, stout, 

 with hair-like rusty scales. Petioles black, 7-18 cm. long, wiry, rusty-villous at least 

 below; leaf -blades lanceolate, glabrous, 5-25 cm. long, 2-pinnate; leaflets numerous, 

 ovate-lanceolate, acuminate, the lower usually smaller than those above, pinnatifid; 

 segments mostly acute, often semi-auriculate : indusia pale, membranous. 



On rocks, Virginia to Alabama, Arkansas and Arizona. Also in Mexico. 



2. CheilaDthes microphylla Sw. Eootstocks with slender brown scales. Peti- 

 oles dark brown, somewhat rusty-pubescent, 10-15 cm. long; leaf -blades ovate-lanceo- 

 late, 10-25 cm. long, 3-pinnate; lower divisions larger and more deltoid than the 

 upper; leaflets deeply incised or pinnatifld: indusium slightly modified. 



On shell heaps, Florida. Also in New Mexico and tropical America. 



3. Cheilanthes leucdpoda Link. Eootstocks stout. Petioles 8-25 cm. long, 

 chaffy at the base ; leaf -blades broadly deltoid-ovate, 5-8' cm. long, 4-pinnate at the 

 base, gradually simpler above, everywhere glandular-puberulent, lowest divisions in- 

 equilaterally deltoid, upper oblong; leaflets short-stalked, the fertile lobules revolute. 



On rocks, Uvalde Canon, Texas. Also in Mexico. 



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

 scales. Petioles tufted, wiry, chestnut-brown, 5-10 cm. long, hirsute; leaf -blades 

 evergreen, herbaceous, 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 hirsute and usually somewhat glandular: ultimate lobes close, 

 roundish or oblong, the margins forming separate herbaceous indusia. [C vestita Sw.] 



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



5. Cheilanthes Tehi Moore. Eootstocks with narrow brown scales lined 

 with black. Petioles 5-10 cm. long, densely tufted, slender, covered with woolly hairs 

 or at length glabrate; leaf -blades ovate-lanceolate, 5-10 cm. long, 2-3-pinnate, the 

 upper surface slightly tomentose, the lower densely woolly with soft whitish brown 

 hairs; upper leaflets oblong-ovate, the lower deltoid, the lowest distant; the segments 

 or their lobes minute, the terminal ones slightly larger than the others, all roundish 

 or obovate, crowded: indusium narrow, herbaceous. [C. gracilis Mett.] 



On rocks, Minnesota to British Columbia, Illinois, Texas and Arizona. 



6. Cheilanthes tomentosa Link. Eootstocks densely chaffy with both striped 

 and bright brown scales. Petioles tufted, 1-2 dm. long, stoutish, densely brown- 

 tomentose; leaf -blades oblong-lanceolate, 3-pinnate, 1.5-4..5 dm. long, densely tomen- 

 tose, especially beneath, with brownish white obscurely articulated hairs; leaflets 

 ovate-oblong or oblong-lanceolate, the ultimate divisions about 1 mm. long, the 

 terminal ones sometimes twice as large as the others: indusium pale, membranous. 



On rocks, Virginia to Missouri, Georgia, Texas and Arizona. Also in Mexico. 



7. Cheilanthes Lindheimeri Hook. Eootstocks slender, chaffy. Petioles scat- 

 tered, 10-18 cm. long, black-brown, covered with scales and wool when young; leaf- 

 blades ovate-lanceolate, 8-20 cm. long, 3-4-pinnate; leaflets crowded, 0.5 mm. long, 

 white-tomentose above, very chaffy beneath, the scales passing into a tomentum. 



On rocks, Llano County, Texas to Arizona and northern Mexico. 



13. HYPOLEPIS Bernh. 

 Eootstocks slender, wide-creeping. Leaves apart, erect, the ample blades long- 

 stalked and pinnately compound. Sori small and roundish, marginal, borne each at 

 the summit of the lower exterior veinlet of the ultimate segments, usually indusiate 

 by the turning back of the small marginal crenature. 



