94 Miihlenbergia, Volume 8 



/ Notholaeiia hypoleuca sp. nov. 



Rootstock short, clothed with shining reddish-black, linear, 

 acute scales: stipes tufted, 2 to 5 cm. long, light brown, clothed 

 with white powder and lanceolate, acute scales: fronds linear in 

 outline, 10 to 15 cm. long, 1.5 to 2.5 cm. wide, bipinnate, dorsal 

 surface sparingly clothed with white powder, the lower densely, 

 but the powder largely hidden by linear-lanceolate brown scales: 

 pinnae 10 to 15 pairs, alternate, oblong-lanceolate, pinnate: pin- 

 nules 4 to 6 pairs to each pinna, oblong, obtuse, broadest at the 

 base: sori brown, continuous around the margins. 



Slavonian canyon, Mule mountains, Cochise county, Ari- 

 zona, on rocky slopes, August, 191 1, no. 1004. 



This species is most closely related to A^. Grayi, from which 

 it differs in the very conspicuous scales on the under side of the 

 frond and several other important features. 



Pellaea truiieata sp. ncn. 

 - Rootstock short, stout, clothed wiih dark, linear, acute, 

 scarious margined scales: stipes i to 2 dm. long, rigid, dark 

 brown and shining: fronds 1.5 to 2 dm. long, 7 to 12 cm. wide, 

 ovate-acuminate to deltoid in outline, glabrous, blue-green, bi- 

 pinnate: pinnae linear to oblong; pinnules 9 to 19 to each lower 

 pinna and ranging to 3 and i at the apex of the rachis, truncate 

 at the base and apex, oblong, 8 to 10 mm. long, 6 to 8 mm. 

 wide, mucro short and scarcely margined; in the mature pinnule 

 the edges rolled in to the midrib. 



Mule mountains, Cochise county, Arizona, in drv rock\- 

 places, x^ugust, 191 1, no gjy. 



Related to P. Wrightiana and P. ornithopus^ from the for- 

 mer of which it can readily be distinguished by its numerous, 

 short pinnules, and from the latter by its absoluteh- constant 

 bipinnate character, observed in abundant material. 



