[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 3H 't*-- This species approaches 

 the genus Radulum in thickness of the fructification, its obliquely 

 ascending hj^Dhae, and in occasional specimens having some 

 raduloid teeth; such specimens have the aspect of Radulum 

 orhiculare but differ from it by presence of the pyriform bodies 

 and cystidia. 



Specimens examined: 

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



suhgiganteum, 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: /. Macoun, 7, 52; Lower St. LawTence Valley, /. 



Macoun, 11, 81; Ottawa, J. Macoun, Ifi, J^l, and 1S6 (in N. Y. 



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



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

 Maine: Piscataquis County, W. A. Murrill, 24-51 (in N. Y. Bot. 



Card. Herb., and Mo. Bot. Card. 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, 



14-153, 14-160 (in part), and two unnumbered specimens (in 



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



C. H. Peck, type (in N. Y. State j\Ius. Herb.) ; Shokan, C. H. 



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



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



L. M. Underwood, 4-8 (in N. Y. Bot. Gard. Herb., and Mo. 



Bot. Gard. Herb., 61409, 61433); "WTiite Plains, W. H. Ballon 



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

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



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



