78 Our Native Ferns. 



as on the rachises ; segments nearly round, ]/i" — }i" broad, the 

 terminal ones larger, margin narrowly incurved, Cal. IV. 



*** Under surf ace both tomentose and scaly. 



15. C. myriophylla, Desv. Rhizoma very short, scaly ; stipes 

 tufted, 2' — 6' high, castarieous, covered with pale-brown scales 

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

 late, tri — quadripinnatifid, smooth or pilose above, beneath mat- 

 ted-tomentose and densely clothed with pale brown narrowly 

 ovate-lanceolate ciliated scales, those of the ultimate segments 

 with long tortuous cilia; pinnae deltoid-ovate, narrower upwards ; 

 ultimate segments minute, %" broad, crowded, innumerable, the 

 margin unchanged, much incurved. Ariz., Nev., Cal. IV. 



16. C. Lindheimerij* Hook. Rhizoma long, slender, chaffy ; 

 stipes scattered, 4' — ^' high, blackish-brown, at first covered with 

 scales and woolly hairs ; fronds 3' — 5' long, ovate-lanceolate, tri — 

 quadripinnate; ultimate segments X" long, crowded; upper sur- 

 face white tomentose, lower surface very chaffy, those of the mid- 

 ribs ciliate at base, those of the segments more and more ciliate 

 passing into entangled tomentum. Western Tex. to Ariz. V. 



\ 4. ALEURITOPTERIS, Fee. Indusia more or less con- 

 fluent; fronds farinose below. 



17. C. argentea, Kunze. Stipes densely tufted, 3' — 6' long 

 castaneous; fronds 3' — 4' long, 2' broad, deltoid, bi — tripinnatifid ; 

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

 polished like the stipe ; upper surface naked, lower thickly covered 

 with white powder ; sori numerous, very small. Alaska. II. 



IX. CRYPTOGRAMME, R. Br. RoCK-BRAKE. 



Sporangia on the back or near the ends of the free veins, form- 

 ing oblong or roundish sori, which are at length confluent and 

 cover the back of the pinnules. Indusium continuous, formed of 

 the membranous somewhat altered margin of the pinnule, at first 

 reflexed along the two sides and meeting at the midrib, at length 

 opening out flat. 



I. C. acrostichoides,* R. Br. Stipes densely tufted, stramin- 

 eous ; fronds dimorphous, sterile ones on shorter stalks tri — quad- 

 ripinnatifid, with toothed or incised segments ; fertile'ones long- 

 stalked, less compound, with narrowly elliptical or oblong-linear 

 pod-like segments. Lake .Superior, Col. to Cal. and northward. H. 



