FERN FAMILY 1049 



2. P. glabella Mett. Scales of rhizome rust-colored; fronds tufted, 2..5-l().7 

 cm. long; stijjcs slender; blades ovate to oblong or ovate-lanceolate; pinnae simple 

 and 0.7-1.9 cm. long, or commonly the lower pinnately trifoliate, those of the 

 lowermost one or two pairs rarely with 4 or 5 segments; segments oblong to 

 lanceolate or the smaller ovate-oblong or siiboval, obtu.se or abruptly acute; 

 branches of midveins mostly once or twice forked; indusia entire or slightly 

 erose. P. pumila Rydb. P. atrnpurpurea occidentalis A. Nels. P. atropurpiirea 

 Bushii Macoun. On dry rocks: Ariz. — -Wyo. — Wash. — Minn. — Ark.^Kan. — 

 N.Y. — Vt. — B.C. Undoubtedly of wider range, especially in the north. Plain — 

 Mont. 



3. P. atropurpurea Link. Scales of rhizome fulvous rust-colored; fronds 

 tufted, 2.5-41.7 cm. long; stipes wiry; blades lanceolate or ovate-lanceolate, pin- 

 nate or usually bipinnate below; sterile segments commonly suboval; fertile 

 segments mostly linear or subhnear, sometimes auricled, obtuse or acute; branches 

 of midveins mostly about twice forked; indusia entire or slightly erose. On dry 

 rocks, particularly limestone: "N.H." — "R.I." — Ga. — nw Mex.— Ariz. — S.D.; 

 "B.C."— "Athabasca." 



4. P. mucronata D. C. Eat. Scales of rhizome black-striped at center, with 

 light tawny margins; fronds tufted, 8-60 cm. long; stipes and rachises dark 

 mahogany-colored or purphsh black, smooth; segments sessile or subsessile, the 

 sterile roundish oval, sometimes subcordate at base, the fertile linear-oblong, 

 with strongly revolute margins. P. Wrightiana Hook. P. longvnucronata 

 Hook. P. truncata Goodding. On rocks: Tex. — Kans. — ^Calif.— L. Calif. Son. 



14. CHEILANTHES Sw. Lip-fern. 



Small ferns with compound, usually chaffy or hairy fronds. Indusium 

 formed of the reflexed margins of the subdivisions, roundish and distinct or con- 

 tinuous. Sori roundish and distinct or more or less confluent, borne on the 

 thickened apices of free veins. 



Blad&s scaly, not tomentose. 1. C. Fendleri. 



Blades tomentose beneath, with or without scales. 



Blades without scalas. 2. C. Feci. 



Blades having scales. 



Ultimate segments oblong-oval; upper surface at first scantily webby, soon glabrous. 



.3. C. (irociUima. 

 Ultimate segments rounded, narrowed toward base; tipper surface tomentose. 



4. C. Ealoni. 



1. C. Fendleri D. C. Eat. Rhizome creepy, chaffy with bright tawny scales 

 without dark centers; fronds mostly scattered, 6-2.5 cm. long; blades ovate- 

 lanceolate, tripinnate; stipes and primary rachises brown, chaffy with mostly 

 slender scales; secondary and tertiary rachises chaffy, the scales imbricate, bright 

 brown, usually white-margined, broadly ovate, entire or subentire, not ciliate or 

 very sparingly ciliate at base; ultimate segments minute, subglobose, entire, or 

 obovate and 2-3-lobed, smooth above, commonly with a single broad scale at 

 the center beneath ; indusia formed of the much recurved margins. Dry rocks : 

 Colo. — "w Tex." — Ariz. Submont. — Mont. 



2. C. Feci Moore. Scales of the rhizome cinnamon-brown, mostly black- 

 striped at center; fronds tufted, 5-16 cm. long; stipes and rachises dark brown 

 or blackish; blades ovate-lanceolate, tripinnate or tripinnatifid, rarely bipinnate; 

 lower pinnae deltoid, those above oblong-ovate; ultimate segments minute, the 

 apical one slightly the largest, their lower surfaces densely tomentose; hairs 

 whitish brown, soft, matted, flattened, jointed; indusium subcontinuous around 

 the segment, formed of its scarcely altered margin. C. lanuginosa Nutt. On or 

 among rocks: B.C. — Minn. — 111. — Ark.— Ariz.; Mex. Plain — Submont. 



3. C. gracillima D. C. Eat. Scales of the rhizome dark rusty brown with 

 darker, not black, centers; fronds tufted, 4-24 cm. long; stipes and primary 

 rachises dark brown or blackish; blades narrowly ovate-lanceolate, bipinnate or 

 sometimes subtripinnate; tomentum consisting of scale-like branching hairs; 

 rachises chaffy, with slender scales ciliate at base; indusium continuous around 

 the segment. On rocks: B.C. — Mont. — Ida. — Calif.; Mex. 



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