30 POLY PODIACEAE. 
3. Pellaea dénsa (Brack.) Hook. 
Oregon Cliff-brake. (Fig. 65.) 
Onychium densum Brack. Fil. U. S. Expl. 
Exp. 120. 1854. 
. Wh FAS — 
Pellaea densa Hook. Sp. Fil. 2: 150. 1858. a) SS 
SPSS 
Rootstock rather slender, chaffy with ; ZS A, g 
blackish scales. Stipes densely tufted, SK .< 
wiry, slender, light brown, 3/-9’ long; 
leaves ovate or triangular-oblong in out- 
line, 1-3’ long, densely 3-pinnate, the seg- 
ments 3//-6’’ long, linear, nearly sessile, 
acuminate or mucronate, those of the fer- 
tile leaves tapering at each end, with 
narrowly recurved margins; apices of the 
rare sterile leaves sharply serrate, these 
otherwise similar to the fertile ones. 
Mt. Albert, Gaspé, Quebec. Also from 
British Columbia to Wyoming and California. 
Summer. 
15. CHEILANTHES 6Gw. Syn. Fil. 126. 1806. 
Mostly pubescent or tomentose rock-loving and small ferns with much divided leaves, 
the sori terminal on the veins, at first small, ultimately more or less confluent. Indusium 
formed fof the reflexed margin of the leaf, roundish and distinct or more or less conflu- 
ent. Sporanges pedicelled, provided with an clastic ring which bursts transversely, often 
much concealed in the scales or tomentum which covers the segments in many species. 
{Greek, in allusion to the lipped indusia of some species. ] 
About 65 species, of temperate and tropical regions. Besides the following, some 14 others 
occur in the western and southwestern parts of North America and one in Florida. 
Leaves nearly glabrous, 2-pinnate. 1. C. Alabamensis. 
Leaves hirsute and glandular, not tomentose ; indusia not continuous. 2. C. lanosa. 
Leaves more or less tomentose ; indusia mostly continuous. 
Leaves 2'—5' long ; stipes slender, at length nearly glabrous. 3. C. gracilis. 
Leaves 6'-15' long ; stipes stout, densely brown-tomentose. 4. C. tomentosa. 
1. Cheilanthes Alabaménsis (Buckl.) Kunze. Alabama Lip-fern. (Fig. 66. ) 
Pteris Alabamensis Buckl. Amer. Journ. Sci. 
45:177- 1843. 
Cheilanthes Alabamensts Kunze, Linnaea, 20 : 
4. 1847. 
Rootstock creeping, rather stout and 
short, clothed with slender brown scales. 
Stipes black, 3/-7’ long, slender, wiry, 
villous at least towards the base with rusty 
wool; leaves lanceolate in outline, glab- 
rous, 2-10’ long, 2-pinnate ; pinnae numer- 
ous, ovate-lanceolate, acuminate, very 
short-stalked, the lowest usually smaller 
than those above; pinnules oblong or tri- 
angular-oblong, mostly acute, often auricu- 
late on the upper side at the base, more or 
less toothed or incised ; indusia pale, mem- 
branous, interrupted by the incising of the 
pinnae. 
On rocks, Virginia to Alabama, west to IIli- 
nois, Arkansas and Arizona. Aug.—Oct. 
