182 Proceedings of the Biological Society of Washington. 



narrow cartilaginous border to the short raucro; sterile pinnules similar 

 but broader, plane, the margin pale, thinnish; leaf tissue coriaceous, 

 light green, slightly glaucous. 



Readily distinguished from P. longimucronata Hook., with which it is 

 contrasted below. It has sometimes been distributed mixed with P. 

 longimucronata and apparently grows in company with that in several 

 localities, but the ranges though similar do not coincide, P. Wrightiana 

 extending farther to the east. The Oklahoma record is of specimens 

 collected at Quanah Mountain in 1891 by C. S. Sheldon (no. 192), listed* 

 as P. ternifolia. The central Texas specimens are from Llano and Gil- 

 lespie Counties (Bray 303, Reverchon 1216, Jermy 351), and the other 

 Texas plants are from the Chenate and Cornudas Mountains (Havard). 

 In New Mexico it has been collected in the Burro Mountains by Rusby 

 and in the Organ Mountains by Wooton and Standley, and has been re- 

 collected at the type locality by J. M. Holzinger, August 27-September 

 12, 1911. There are numerous Arizona specimens, coming from several 

 parts of the State but largely from the mountain ranges of Pima and 

 Cochise Counties, and there is a single specimen from Lower California 

 (El Rancho Viejo, April 29, 1889, T. S. Brandegee). The species ascends 

 to at least 2,400 meters in the Chiricahua range (Blumer 1867). 



Pellaea longimucronata Hook. Sp. Fil. 2 : 143. pi. 115. A. 1858. 



Pellaea Wrightiana longimucronata Davenp. Cat. Davenp. Herb. Suppl. 



46. 1883. 

 Pellaea truncata Goodding, Muhlenbergia 8 : 94. 1912. 



Type.— Collected in New Mexico, in 1851, by Charles Wright (no. 2131 ), 

 the precise locality not given. According to a note by Wooton, accom- 

 panying a specimen of this number in the National Herbarium, it was 

 collected on "mountain sides near Conde's Camp, Sept. 1, 1851," Conde's 

 Camp being in the western part of Grant County, near the Arizona 

 boundary. The specimen accords with Hooker's description and illus- 

 tration. 



Distribution. — Southwestern New Mexico to southern Utah, extreme 

 southern Nevada, and western Arizona ; also in south-central Colorado. 



Fronds mostly fertile, but sterile fronds much commoner than in P. 

 Wrightiana, partially fertile ones less common ; lamina triangular-ovate, 

 fully bipinnate almost to the acuminate simply pinnate apex ; middle and 

 basal pinnae of fertile fronds the largest, the pinnules (6 to 10 pairs) 

 rigidly divaricate, small, usually decreasing in size toward the reduced 

 apical segment, all sessile or short-petiolate, articulate, many of them 

 deciduous after maturity; fertile pinnules sharply mucronate, very 

 strongly revolute (the edges frequently meeting), the margins slightly 

 modified, paler, usually somewhat erose -denticulate; sterile pinnules 

 fewer, larger, relatively broader, often truncate, conspicuously long- 

 mucronate, the margins plane or repand, erose-denticulate or sometimes 

 * Contr. U. S. Nat. Herb. 1 : 201. 1892. 



