34 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



Ladyfern. Arizona specimens pertain to var. californicum Butters, 

 which extends from southern Idaho and western Wyoming to New 

 Mexico and Arizona. White ^ Mountains (Apache County), Chiri- 

 cahua and Huachuca Mountains (Cochise County), Santa Catalina 

 Mountains (Pima County), 7,000 to 8,000 feet; rich shaded ground 

 about springs and along streams. 



11. PITYROGRAMMA 



Ferns of dryish banks and ledges, the stoutish rhizomes paleaceous; 

 fronds clustered, long-stipitate; blades 1- to 3-pinnate, deltoid-pentag- 

 onal in the Arizona species, densely ceraceous beneath; sporangia 

 following the short, spreading, branched veinlets throughout, conflu- 

 ent with age. 



1. Pityrogramma triangularis (Kaulf.) Maxon, Contrib. U. S. Natl. 

 Herbarium 17: 173. 1913. 



Gymnogramma triangulare Kaulf., Enum. Fil. 73. 1824. 



The typical form ranges from British Columbia (Vancouver Island) 

 to Nevada and Baja California. 



Goldfern. In Arizona the species is represented by var. maxonii 

 Weatherby, which is not uncommon in Gila, Maricopa, Pinal, and 

 Pima Counties, 2,000 to 2,500 feet, on rock ledges; type from Rincon 

 Mountains (Blumer 3271). This variety occurs also in southern Cali- 

 fornia, Sonora, and Baja California. 



12. BOMMERIA 



Small ferns of rocky situations, the rhizomes wide-creeping; fronds 

 uniform; blades palmately divided, broadly pentagonal, the divisions 

 bipinnatifid, conspicuously hairy; sori linear, following the course of 

 the veins, nonindusiate. 



1. Bommeria hispida (Mett.) Underw., Torrev Bot. Club Bui. 29: 

 633. 1902. 



Gymnogramme hispida Mett. in Kuhn, Linnaea 36: 72. 1869. 



Mountains of Yavapai, Gila, Graham, Cochise, Santa Cruz, and 

 Pima Counties, 4,000 to 6,000 feet, on shaded cliffs. Western Texas 

 to Arizona and Mexico. 



]3. PTERIDIUM. Bracken 



Coarse ferns, the slender, woody rhizome wide-creeping under- 

 ground; fronds borne singly, large; blades deltoid-ovate, pinnately de- 

 compound; veins free; sori linear, borne on a continuous transverse 

 receptacle connecting the vein ends; indusium double, the conspicu- 

 ous outer one formed by the reflexed membranous leaf margin, the 

 inner one minute, facing outward beneath the sporangia. 



1. Pteridium aquilinum (L.) Kuhn in Decken, Reisen, III. Bot. 

 Ost-Afrika 11. 1879. 



Pteris aquilina L., Sp. PI. 1075. 1753. 



Viewed broadly, this is a nearly cosmopolitan species, the type 

 European. Arizona material is referable to var. pubescens Underw., 

 which occurs in Quebec and the Great Lakes region, and from Alaska 

 south to South Dakota, Texas, New Mexico, Arizona, and California. 



