Cheilanthes. 75 



Var. lanuginosa,* Hook. Fronds silky-pubescent or tomen- 

 tose, especially on the under surface ; otherwise as in the typical 

 form. Utah, Cal. and northward. 



VIII. CHEILANTHES, Swz. LiP-FERN. 



Sori terminal or nearly so on the veins, at first small and 

 roundish, afterwards more or less confluent. Indusiura formed 

 of the reflexed margin of the frond, roundish and distinct or 

 more or less confluent. Veins free. 



I I. ADIANTOPSIS, Fee. Indusia distinct, roundish, con- 

 fined to the apex of a single veinlet. 



1. C. Californica,* Mett. Rhizoma short, creeping, chaffy ; 

 stipes densely tufted, dark brown, glossy, 4' — 8' long ; fronds 4' 

 or less each way, broadly deltoid-ovate, smooth on both surfaces, 

 quadripinnatifid ; lower pinnae largest, triangular ; upper ones 

 gradually smaller and simpler; ultimate segments lanceolate, 

 acute, incised or serrate ; indusia membranous. Cal. IV. 



§ 2. EUCHEILANTHES. Indusia more or less confluent, 

 usually extending over the apices of several veinlets, but not con- 

 tinuous all round the segment; segments mostly flat, not bead-like. 

 ^Segments of the frond smooth. 

 \PinncEfew, not more than 3 — 6 pairs. 



2. C. Wrightii,* Hook. Stipes castaneous, slightly chaffy at 

 base, 1' — 2' high ; fronds 2'—^' long> ovate-oblong, tripinnatifid, 

 segments more or less incised ; indusium sub-continuous or inter- 

 rupted, similar to frond in texture. Western Tex. to Ariz. V. 



^■\PinncB numerous. 



3. C. microphylla, Swz. Rhizoma creeping, short; stipes 

 dark-brown, glossy, rusty-pubescent on the upper side, 4^—6' 

 long ; fronds 4' — 6' long, ovate-lanceolate, bi — tripinnate ; pinnae 

 lanceolate, the lowest ones usually largest and more deltoid ; pin- 

 nules oblong or deltoid-ovate, deeply incised or pinnate ; indusium 

 similar in texture to frond, interrupted or sub-continuous. Fla.. 

 Ark., N. Mex. IV. 



4. C. Alabamensis,* Kunze. Rhizoma creeping clothed with 

 slender brown scales ; stipes black with scanty ferruginous wool ; 

 fronds 2' — 10' long, narrowly lanceolate, bipinnate ; pinnae close, 

 ovate-lanceolate, the lowest ones not enlarged usually smaller than 

 those above ; pinnules mostly acute, often auriculate on the upper 

 side at the base ; indusia pale, membranous, interrupted only by 

 the incising of the pinnules. Va., Ala., Tenn. to Tex. VI. 



^'^Segtnents of the frond glandular viscid. 



