FUNGI. 25 



ing dead trunks of aspen, upper La Plata River at 10,000 

 feet, 13 July, n. 795. 



POLYPORUS, sp. On logs of Populus tremuloides, La Plata 

 Mts., June and July, n. 186 and 799. Perhaps new, but 

 approximating some thick forms of P. pergamenus. 



POLYPORUS PINI (Brot.), Fr. 1. c. 336. On logs of Picea 

 Engelmannii, La Plata Mts., July, n. 800. 



AGARICACE.E. 



NAUCORIA COLORADOENSIS n. sp. Pileus 3-6cm, convex, 

 becoming expanded, slightly umbonate, tawny yellowish- 

 brown, often darker on umbo, densely clothed with felted 

 yellowish hairs, margin not striate, strongly incurved when 

 young; veil arachnoid, soon evanescent; gills adnate, sub- 

 crowded, tawny-white, changing to dark-brown; spores oval, 

 dark rusty-brown, usually with a large oval vacuole, about 

 10x6/x ; stem 4-6cm high by 4-8 mm thick, slightly bul- 

 bose below, colored and clothed like the pileus, but hairs 

 closely appressed and less felted. 



On moist shaded ground near the river at Mancos, June 

 21, n. 22. 



EXOACACE^E. 



TAPHRIA CCERULESCENS (Mont.) Tul. Ann. Sci. Nat. 1866, 

 p. 127. No. 32, on Quercus undulata, Mancos, 7,000 feet, 

 June 22. Common in oak thickets on hillsides near the 

 river. 



HELOTIACE^E. 



LACHNUM ENGELMANNI n. sp. (Trichopeziza). Scattered 

 or gregarious, subsessile or short stipitate, l-4mm in 

 diameter, flat and expanded when wet, incurved when dry, 

 exterior thickly clothed with dark fuscous, septate, rigid 

 hairs, 200 or more by 5/x, becoming attenuate toward the 



