[Vol. 7 

 132 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



On rotting logs and limbs of frondose species such as Acer, 

 Betula, Fagus, Quercus, and Tilia. Canada to West Indies and 

 westward to British Columbia. April to October in the north 

 and October to March in the West Indies. Common. Occurs 

 in Scandinavia also. 



The specimens upon which were based the original descrip- 

 tions of S. Murrayi and its synonyms were resupinate; in each 

 instance the species was included in Stereum or Thelephora, 

 although longitudinally arranged hyphae are not present and 

 do not constitute an intermediate layer. The distinguishing 

 characters of the resupinate specimens are their thickness, 

 pallid to pale avellaneous color, tubercular and deeply cracked 

 hymenium, abundance of vesicular organs throughout the whole 

 thickness of the fructification, and occurrence on a frondose 

 substratum. The horny crust forming the upper side of the 

 pileus is similar to that of some species of Fomes and is unique 

 among our Stereums, but the reflexed stage is so rare that this 

 character does not often afford help in recognizing the species. 

 The geographical distribution in three widely separated areas is 

 remarkable; it seems probable that the European stations in 

 Norway and Sweden should be regarded as merely outlying 

 stations of a common North American species; it is very strange 

 that a species presumably northern should be well established 

 in Cuba and Jamaica and absent from Florida and the Carolinas, 

 yet specimens from all three isolated regions are identical in 

 aspect and microscopical structure. 



Specimens examined: 

 Exsiccati: Ell. & Ev., Fungi Col., 704, under the name Stereum 



rugosum; Ell. & Ev., N. Am. Fungi, 2903, under the name 



Corticium colliculosum; Shear, N. Y. Fungi, 51, under the 



name Stereum rugosum. 

 Norway: M. N. Blytt, type of Stereum tuberculosum (in Herb. 



Fries). 

 Sweden: Island of Gotland, on Abies excelsa, L. Romell, 135. 

 Canada: J. Macoun, 18, 43, 60; Billings Bridge, J. Macoun, 44; 



Lower St. Lawrence Valley, J. Macoun, 69, 72. 

 Ontario: J. Dearness, 1022 (in Mo. Bot. Gard. Herb., 22682); 



Blackwater, J. McFarlane, Univ. Toronto Herb., 330 (in 



Mo. Bot. Gard. Herb., 44865); Harraby, Lake Rosseau, 



