FLOWERING PLANTS AND FERNS OF ARIZONA 31 



Oak Creek, Coconino County, 5,400 feet {Goldman 2188). New- 

 foundland to Manitoba, south to Georgia, Alabama, and Arkansas, 

 and in the mountains to New Mexico and Arizona. 



2. Cystopteris fragilis (L.) Bernh., Neues Jour. Bot. Schrad. I 2 : 27. 

 pi. 2 J. 9. 1806. 



Foly podium fragile L., Sp. PL 1091. 1753. 

 Filix fragilis Gilib., Exerc. Phytol. 558. 1792. 



White Mountains (Apache County), San Francisco Peaks (Coconino 

 County), and mountains of Graham, Gila, Cochise, and Pima Counties, 

 6,000 to 11,000 feet, rich moist shaded soil, among rocks and around 

 springs. 



Brittlefern. This is the most widely distributed of all ferns, being 

 nearly cosmopolitan. In North America the typical form of the 

 species ranges from Greenland to Alaska, south to northern New 

 England, the Great Lakes region, Missouri, and in the mountains to 

 western Texas, New Mexico, Arizona, and southern California. Other 

 varieties occupy adjacent regions or partially overlap the range of the 

 typical variety. Most of the Arizona specimens are referable to var. 

 tenuifolia (Clute) Broun, a singularly delicate and beautiful large 

 form. 



7. WOODWARDIA. Chainfern 



Coarse ferns of moist shady situations, the stout woody rhizomes 

 paleaceous; fronds several, in a large crown, the blades leafy, pinnate- 

 pinnatifid; sori linear-oblong, nearly straight, borne singly on the 

 outer vein of a continuous series of elongate costal areoles, sunken, 

 facing inward and occupying the areoles, the elongate arching indusia 

 persistent. 



1. Woodwardia fimbriata J. E. Smith ex Rees's Cyclop. 38: no. 6. 



1818. 



Woodwardia chamissoi Brack, in Wilkes, U. S. Expl. Exped. 16: 

 138. 1854. 



Willow Spring (southern Apache County), Sierra Ancha and 

 Mazatzal Mountains (Gila County), Huachuca Mountains (Cochise 

 County), Santa Rita and Santa Catalina Mountains (Pima County), 

 5,300 to 7,200 feet, rich soil in canyons. British Columbia to Nevada, 

 Arizona, and California. 



8. CETERACH 



Small, strongly xerophilous ferns of distinctive form and habit, the 

 rhizome short and conspicuously paleaceous; fronds rotate, the short 

 stipes imbricate-paleaceous; blades deeply sinuate-pinna tifid, spongi- 

 ose-coriaceous, the veins free (in the Arizona species) or partially 

 areolate; sori linear; indusium lateral, as in Asplenium. 



1. Ceterach dalhousiae (Hook.) C. Chr., Ind. Fil. 170. 1905. 



Asplenium dalhousiae Hook., Icon. PL pi. 105. 1837. 

 Asplenium alternans Wall, ex Hook., Sp. Fil. 3: 92. 1860. 

 Asplenium jerrissii Clute, Fern Bui. 16: 1. 1908. 

 Asplenium rupium Goodding, Muhlenbergia 8: 92. 1912. 



Mule and Huachuca Mountains (Cochise County). Baboquivari 

 Mountains (Pima County), about 6,000 feet; shaded moist soil and 



286744°— 42 3 



