[Vol. 12 

 292 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fructifications broadly effused, somewhat membranaceous, 

 separable from the substratum in small portions when moistened, 

 thin, becoming cartridge-buff to cream-buff in the herbarium, not 

 shining, cracking in drying, the margin thinning out; in section 

 60-360 ;x thick, not colored, composed throughout of suberect 

 h)^3hae about 4 tx in diameter, not incrusted and occasionally 

 nodose-septate, of elongated flexuous cystidia, and of great 

 numbers of subglobose, even chlamydospores 43/^-5 X 4 [x; 

 cystidia not incrusted, flexuous, elongated, with somewhat the 

 aspect of gloeocystidia, 30-100 X 6-9 [x, in all regions of fruc- 

 tification, many starting from the substratum, tapering upward, 

 protruding up to 40 (jl beyond the basidia ; basidia with 4 sterig- 

 mata; basidiospores hyaline, even, subglobose, 5-6 X 4}/^ [i. 

 Fructifications 2-6 cm. long, 1-3 cm. wide. 

 On bare ground in woods and on bark and wood of decaying 

 Alnus, Betula, Populus, Quercus, and Ceanothus, rarely on a 

 coniferous substratum. Canada to Massachusetts and westward 

 to Washington. July to March. Occasional. 



P. Peckii is placed in the species group with P. glebulosa on 

 account of the large, even-walled cystidia which are more flexuous 

 than those of the latter species and with more the aspect of gloeo- 

 cystidia, but I have not yet demonstrated by granular contents 

 that they are gloeocystidia. P. Peckii is distinguished by the 

 great number of subglobose spores distributed throughout the 

 whole fructification in sections studied. 



Specimens examined: 

 Canada: J. Macoun, 18, 51; Lower St. Lawrence Valley, /. 



Macoun, 5. 

 Massachusetts: Cherry Brook, E. A. Burt & A. B. Seymour; 

 Magnolia, W. G. Farlow (in Burt Herb, and Mo. Bot. Gard. 

 Herb., 44066); Sharon, A. P. D. Piguet, comm. by W. G. Far- 

 low, 11 (in Mo. Bot. Gard. Herb., 55590) and by Farlow Herb., 

 132 (in Mo. Bot. Gard. Herb., 59622); Wellesley, L. W. 

 Riddle, 11. 

 New York: Ithaca, G. F. Atkinson, 5089; Karner, H. D. House, 

 comm. by N. Y. State Mus. Herb, (in Mo. Bot. Gard. Herb., 

 54361, 55204); Westport, C. H. Peck, 6, type; White Plains, 

 W. H. Ballon, 1 (in Mo. Bot. Gard. Herb., 55030). 



