[Vol. 12 

 226 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



tapering, attenuated to a long and very sharp point; basidia 

 with 4 sterigmata; spores hyaline, even, subglobose, about 2J^ 

 X 2 (jl, copious. 



Fructifications 2-2}^ cm. in diameter. 



On very rotten coniferous log perhaps Thuja. Washington. 

 October. Rare. 



P. humifaciens was so sparingly and loosely connected with the 

 substratum by the white, mycelial strands that the impact of a 

 hatchet against the log caused fructifications to fall away. P. 

 arachnoidea, a related species, has quite different hyphae and 

 cystidia and mode of attachment. 



Specimens examined: 

 Washington: Chehalis, C. J. Humphrey, 6266, type. 



10. P. Candida (Pers.) Lyman, Boston Soc. Nat. Hist. Proc. 

 33: 167. pi 20, f. 44-55, pi 26, f. 138. F. 1907. 



Aegerita Candida Persoon, Roemer Neues Mag. Bot. 1: 120. 

 1794 (imperfect stage); Syn. Fung. 684. 1801; Fries, Syst. 

 Myc. 3 : 220. 1829; Sacc. Syll. Fung. 4 : 661. 1886. Sclerotium 

 Aegerita Hoffmann, Fl. Germ. 2: pi 9,f. 1. 1795. Peniophora 

 Aegerita (Hoffm.) v. Hohnel & Litschauer, K. Akad. Wiss. Wien 

 Sitzungsber. 116: 814. 1907; 123: 83. 1914; Sacc. Syll. Fung. 

 21: 410. 1912; Bourdot & Galzin, Soc. Myc. Fr. Bui. 28: 382. 

 1913; Rea, Brit. Basid. 687. 1922. Kneiffia farinosa Bresadola, 

 Ann. Myc. 1: 105. 1903; Sacc. Syll. Fung. 17: 178. 1905. 



Illustrations: See Sacc. Syll. Fung. 19: 25, for numerous 

 figures of imperfect stage. 



Fructifications effused, thin, adnate, very tender, at first fari- 

 nose, then forming a continuous hymenium, white to pale cream- 

 color, very minutely velvety under a lens, the margin thinning 

 out, indeterminate, usually with clusters of the minute, globose, 

 white, imperfect stage adjoining; in section 40-100 y. thick, not 

 colored, with hyphae suberect, thin-walled, collapsing, of ir- 

 regular outline, about 4 y. in diameter; no gloeocystidia; cystidia 

 incrusted, scattered, starting from the substratum, 40-100 X 

 6-12 \l; spores hyaline, even, subglobose, 6-7 X 43/-6 \l. 



Fructifications 2-4 cm. long, 1-2 cm. wide. 



On decaying wood and fallen branches of Alnus, Populus, Acer, 



