g6 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 (i" — t" 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. 



i8. 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-" — y broad, 

 the terminal ones larger, margin narrowly incurved. Califor- 

 nia. 



*** Under surface both tomentose and scaly. 



19. 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, i" broad, crowded, 

 innumerable, the margin unchanged, much incurved. Very 

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



20. 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- 

 lanceolate, tri — quadripinnate ; ultimate segments J" 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. 



21. 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- 



