[Vor. 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. Murray 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 fructifieation, 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, 
