28 MISC. PUBLICATION 4 2 3, U. S. DEPT. OF AGRICULTURE 



3. Woodsia mexicana Fee, Mem. Foug. 7: 66. 1854. 

 Mountains of southern Coconino, Yavapai, Greenlee, Gila, Cochise, 



Santa Cruz, and Pima Counties, 3,500 to 8,000 feet, crevices of cliffs 

 and rocky slopes. Western Texas to Arizona and Mexico. 



4. Woodsia oregana D. C. Eaton, Canad. Nat. II. 2: 90. 1865. 

 Navajo Mountain, Kaibab Plateau, Grand Canyon, San Francisco 



Peaks, etc. (Coconino County), 5,500 to 11,500 feet, from the pinyon 

 belt to timber line ; rock crevices. Gaspe Peninsula to British Colum- 

 bia, south to northwestern Oklahoma, New Mexico, Arizona, and 

 southern California. 



2. POLYPODIUM. Polypody 



Plants of varied habit, the rhizomes paleaceous, mostly slender and 

 creeping; fronds several, articulate to the rhizome; blades once pinnate 

 or pinnatisect in the Arizona species; sori round or oval, large, dorsal, 

 separate, nonindusiate. 



Key to the species 



1. Blades naked; veins free 1. P. hesperium. 



1. Blades copiously scaly beneath; veins areolate 2. P. thyssanolepis. 



1. Polypodium hesperium Maxon, Biol. Soc. Wash. Proc. 13: 200. 



1900. 



Polypodium prolongilobum Clute, Fern Bui. 18: 97. 1910. 

 Polypodium vulgare var. perpusillum Clute, Fern Bui. 18: 98. 

 1910. 



Mogollon Escarpment (southern Coconino County), Sierra Ancha 

 (Gila County), Huachuca Mountains (Cochise County), Santa Cata- 

 lina Mountains (Pima County), 7,000 to 8,000 feet, sides of canyons. 

 South Dakota to Yukon, south to New Mexico, Arizona, southern 

 California, and Baja California. 



Variable, its relation to P. vulgare L. not well understood. 



2. Polypodium thyssanolepis A. Br. ex Klotzsch, Linnaea 20: 392. 



1847. 

 Chiricahua and Huachuca Mountains (Cochise County), Babo- 

 quivari Mountains (Pima County), at 5,000 to 6,000 feet, among 

 rocks in canyons. Western Texas to Arizona, Mexico, Peru, and 

 Bolivia ; Jamaica ; Hispaniola. 



3. POLYSTICHUM. Hollyfern 



Rigid ferns of talus slopes and rocky forests, the woody rhizomes 

 stout, copiously paleaceous; fronds stiffly ascending; blades uniform, 

 simply pinnate in the Arizona species, of harsh texture, with sharply 

 toothed margins; veins free; sori round, dorsal, the indusium orbicular, 

 centrally peltate. 



1. Polystichum lonchitis (L.)Roth, Poem. Arch. Bot. 2 x : 106. 1799. 

 Polypodium lonchitis L., Sp. PL 1088. 1753. 



Pinal eno Mountains, above sawmill (Thornber and Shreve 7767). 

 Newfoundland to Alaska, southern Ontario, Michigan, and Montana, 

 and in the mountains to Colorado, Arizona, and California; Greenland; 

 Eurasia, 



