Fungi 15 c 



expectation was enhanced by the fact that 23 species have been recorded on 

 Greenland hosts and no less than 40 in the Alaska list (op. cit.). Although every 

 plant in the Canadian Arctic collection was scrutinized for rusts in any stage, 

 only the three named above were detected. 



In 1909 Professor A. S. Hitchcock, Agrostologist to the U.S. Dept. of Agri- 

 culture, made a collecting trip through interior Alaska and part of Yukon in 

 the neighbourhood of Dawson. He collected five Uredines in Yukon which Dr. 

 J. C. Arthur identified as follows: — 



Puccinia rubefaciens Johanns. on Galium boreale; Aecidium Allenii Clint, 

 on Shepherdia canadensis; Melampsora Ribesii-Salicum Bubak II on Salix 

 glauca; Melampsoropsis ledicola (Peck) Arth. II on Ledum groenlandicum; and 

 Peridermium boreale Arth. & Kern on Picea canadensis. 



It is to be noted that Dr. Simmons did not find any Uredineae in Ellesmere 

 land. Rev. Mr. Berkeley determined a single example brought back by the 

 Nares expedition, collected at Pnoven, to be Trichobasis Pyrolae Berk. 



USTILAGINACEAE. 



Schizonella melanogramma (DC.) Schroet. 



In good fruit, parasitic on the leaves of Carex stans Drej . Herschel island, 

 Aug. 9, 1914, 97661. 



I find no record of any other collection of this smut in the arctic regions. 

 Dr. Simmons collected Sphacelotheca Hydropiperis (Schum.) de By. on Poly- 

 gonum viviparum L. and Cintractia Caricis (Pers.) Magn. on Elyna Bellardii 

 (All.) K. Koch. 



The Alaska list (op. cit.) names three species of Ustilago and a Tuburcinia. 

 The smuts like the rusts seem to be rare in the Canadian arctic regions. 



BASIDIOMYCETES. 



POLYPORACEAE. 



Boletus scaber Fr. 



On Herschel island, July 31, 1916. 



The specimen had been preserved in alcohol. Soaking in water recovered 

 some of its characters, particularly the viscidity of the pileus. The spores are 

 very large, 16-18 x 5-6 /i, exceptionally reaching 20 /x in length with the extreme 

 width 8 fjL. This is the only collection of a Boletus that I find recorded west of 

 Greenland. 



It is not to be wondered at that the wood-inhabiting Thelephores, Hydnums 

 and Polypores should be rare or absent where stunted willows and birches are 

 the only kindred of the temperate forests. 



AGARICACEAE. 



Cantharellus muscigenus Fr. 



Pihumalerksiak island, off Cockburn point, July 15, 1916. 



Small gray-brown plants, 2 cm. high, having their mycelium apparently 

 parasitic on the mosses. 



Russula sp. 



On high tundra, Herschel island, July 31, 1916. 

 Collector's note: "Shining, purple-rose, otherwise white." 

 The spores are echinulate, globose, 10 fi; cystidia numerous, obtusely conic, 

 30-35 X 12 IX. 



