1926] 



BURT — THE THELEPHORACEAE OF NORTH AMERICA. XIV 227 



Ulmus, etc., and on the ground. In Europe, and from Massa- 

 chusetts to Missouri. October and November. Rare. 



The association of the effused, white fructifications of P. Can- 

 dida, with the clustered, small, globose, white or cream-colored 

 fructifications — about 5 or 6 to a mm. — of the imperfect stage, 

 Aegerita Candida, affords an easy means of recognizing P. Candida. 



Specimens examined: 

 Poland : Eichler, part of the type of Kneiffia farinosa, comm. by 



Bresadola. 

 France: Allier, H. Bourdot, 19908. 

 New Hampshire: Hanover, G. R. Lyman. 

 Massachusetts: Arlington, A. P. D. Piquet, comm. by W. G. 



Farlow, 33; Waverly, G. R. Lyman, two gatherings. 

 New York: Ithaca Flats, G. F. Atkinson. 

 Missouri: Creve Coeur, E. A. Burt (in Mo. Bot. Gard. Herb., 



56059), and F. P. McWhorter (in Mo. Bot. Gard. Herb., 57309). 



11. P. cana Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb, and N. Y. Bot. Gard. Herb. 



Fructifications effused, closely adnate, very thin, hypochnoid, 

 not forming an interwoven membrane, pilose under a lens, the 

 margin pruinose, indeterminate; in section 10-30 [x thick, not 

 colored, consisting of short, erect, simple or once- or twice- 

 branched hyphae S-S}/2 [i in diameter, not incrusted, not nodose- 

 septate, and of large cystidia; no gloeocystidia ; cystidia heavily 

 incrusted, conical, 50-60 X 10-18 (x, protruding 30-45 \i., start- 

 ing from the substratum, very numerous; spores hyaline, even, 

 3-33^ X 13^ [JL as seen on basidia. 



Fructifications fragmentary, with the fragments 13^-2 cm. 

 long, 10-15 mm. wide. 



On dark, brittle wood humus — probably of a frondose species. 

 Florida. March. 



P. cana is so thin and hoary that it is likely to be regarded as a 

 Hyphomycete unless examined with the microscope. The large, 

 conical, incrusted cystidia and small spores distinguish it from 

 P. albugo. 



Specimens examined : 

 Florida: Cutler Hummock, W. A. Murrill, 82, type, and 83, 



