96 OUR NATIVE FERNS AND THEIR ALLIES. 



secondary and ultimate rachises larger, broadly-ovate, entire or 

 nearly so, usually edged with white, imbricate and overlapping 

 the (J" -" broad) sub-globose ultimate segments; these are 

 naked above, and commonly bear at their centre a single broad 

 scale; indusium formed of the much incurved margin. Texas 

 and Colorado to California. 



17. C. Clevelandii D. C. Eaton. Stipes scattered, 2' 6' 

 long, dark-brown, scaly when young, but at length nearly smooth ; 

 fronds 4' 6' long, ovate-lanceolate, tripinnate, smooth above, 

 deep fulvous-brown below from the dense covering of closely 

 imbricate, ciliate scales growing on the ultimate segments as 

 well as on the rachises; segments nearly round, ^" J" broad, 

 the terminal ones larger, margin narrowly incurved. Califor- 

 nia. 



*** Under surface both tomentose and scaly. 



18. C. myriophylla Desv. Rootstock very short, scaly; 

 stipes tufted, 2' 6' high, castaneous, covered with pale-brown 

 scales and woolly hairs intermixed ; fronds 3' 8' long, oblong- 

 lanceolate, tri quadripinnatifid, smooth or pilose above, be- 

 neath matted-tomentose and densely clothed with pale-brown, 

 narrowly ovate-lanceolate, ciliate scales, those of the ultimate 

 segments with long, tortuous cilia; pinnae deltoid-ovate, nar- 

 rower upwards; ultimate segments minute, |" broad, crowded, 

 innumerable, the margin unchanged, much incurved. Very 

 variable. (C. elegans Desv., C. villosa Dav.) Texas to Arizona. 



19. C. Lindheimeri Hook. Rootstock long, slender, chaf- 

 fy ; stipes scattered, 4' 7' high, blackish-brown, at first cov- 

 ered with scales and woolly hairs; fronds 3' 8' long, ovate- 

 lanceoUite, tri quadripinnate ; ultimate segments " long, 

 crowded ; upper surface white tomentose, lower surface very 

 chaffy, those of the midribs ciliate at base, those of the segments 

 more and more ciliate, passing into entangled tomentum. West- 

 ern Texas to Arizona. 



4. ALEURITOPTERIS Fee. Indusia more or less confluent ; 

 fronds farinose below. 



20. C. argentea (Gmel.) Kunze. Stipes tufted, 3' 6' long,, 

 castaneous; fronds 3' 4' long, 2' broad, deltoid, bi tripinnati- 

 fid ; lower pinnae much the largest, cut nearly to the rachis; 

 rachis polished like the stipe ; upper surface naked, lower thick- 



