32 FERN FAMILY 



appearance it is much like our C. myriophylla but the fronds, although scaly 

 beneath, are not woolly, and the rootstocks are elongated and cord-like. 



7. PELLAEA. Cliff-brake. 

 Usually small ferns with fronds divided 1 to 4 times, en- 

 tirely without scales or wool except for a small tuft of scales 

 at the base of the stalk. Sori near the ends of the free veins, 

 eventually forming a marginal line which is covered by a con- 

 tinuous indusium formed of the altered reflexed margin of the 

 segment. Stalks dark-brown, smooth and polished. (Cheilan- 

 thes calif ornica might be sought here, but the separate lunate 

 indusia turned back over the ends of fertile veinlets between 

 the teeth readily distinguish it.) 



Fronds simply pinnate. 



Texture thick, veins not plainly visible; pinnae 



mostly not parted 1. P. bridgesii. 



Texture thin, veins clearly visible; pinnae mostly 



2-parted 2. P. breweri. 



Fronds 2-pinnate; texture thick, veins not visible. 



Fronds narrowly linear in outline 4. P. brachyptera. 



Fronds broader, lanceolate to ovate in outline. 



Segments sharply pointed 5. P. wrightiana. 



Segments obtuse or notched at tip 6. P. andromedaefolia. 



Fronds 3-pinnate when fully developed, at least toward 

 base of the frond. 



Segments obtuse or notched at tip 6. P. andromedaefolia. 



Segments sharply tipped. 



Fronds oblong-lanceolate, 4 to 12 in. long 3. P '. ornithopus. 



Fronds triangular, 1 to 3 in. long 7. P. densa. 



1. P. bridgesii Hook. Stalk 2 to 6 in. long, brown and 

 glossy. Fronds blue-green, as long or longer than the stalks, 

 y 2 to \y 2 in. wide, linear-oblong, simply pinnate; segments 



x * 



Pellaea bridgesii 



Pellaea breweri 



