[Vol. 12 

 300 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fructifications 3-7 cm. long, 1-3 cm. broad, sometimes larger 

 by confluence. 



Common on bark of decaying logs and fallen branches of 

 Populus and also on Tilia, Quercus, Acer, and other frondose 

 species. Canada to Alabama, westward to Idaho, in Europe and 

 in Japan. July to November and in April. 



P. mutata is a thick, somewhat fleshy, white, or whitish species 

 occurring usually on bark of fallen poplar and basswood and 

 showing in sectional preparations pyriform gloeocystidia, cystidia, 

 and spores usually about 12 X 3*/ \l. This species approaches 

 the genus Radulum in thickness of the fructification, its obliquely 

 ascending hyphae, and in occasional specimens having some 

 raduloid teeth; such specimens have the aspect of Radulum 

 orbiculare but differ from it by presence of the pyriform bodies 

 and cystidia. 



Specimens examined: 

 n7 Exsiccati: Ellis, N. Am. Fungi, 717 a, under the name Corticium 



subgiganteum, 719, under the name Corticium laeve; Ell. & Ev., 



Fungi Col., 308, under the name Corticium laeve. 

 Austria: Langenschonbich, F. v. H"hnel, comm. by V. Litschauer. 

 Canada: J. Macoun, 7, 52; Lower St. Lawrence Valley, J. 



Macoun, 11, 81; Ottawa, /. Macoun, Jfi, 41, and 136 (in N. Y. 



State Mus. Herb., and Mo. Bot. Gard. Herb., 55924) ; Ontario, 



Harraby, E. T. & S. A. Harper, 685. 

 Maine: Piscataquis County, W. A. Murrill, 2451 (in N. Y. Bot. 



Gard. Herb., and Mo. Bot. Gard. Herb., 61402); Portage, 



L. W. Riddle, 16. 

 Vermont: Middlebury, E. A. Burt, two gatherings. 

 New York: Ithaca, G. F. Atkinson, 22965; Karner, H. D. House, 



14-158, 14-160 (in part), and two unnumbered specimens (in 



Mo. Bot. Gard. Herb., 44712, 44706, 54367, 55215); Sevey, 



C. H. Peck, type (in N. Y. State Mus. Herb.); Shokan, C. H. 



Peck, T24 (in Mo. Bot. Gard Herb., 54660); Slingerlands, 



C. H. Peck, T 23 (in Mo. Bot. Gard. Herb., 54659); Syracuse, 



L. M. Underwood, 48 (in N. Y. Bot. Gard. Herb., and Mo. 



Bot. Gard. Herb., 61409, 61433); White Plains, W. H. Ballou 



(in Mo. Bot. Gard. Herb., 10458). 

 New Jersey: Newfield, /. B. Ellis, in Ellis, N. Am. Fungi, 717a, 



719, and Ell. & Ev., Fungi Col., 308. 



