1918] 
BURT—THELEPHORACEAE OF NORTH AMERICA, IX 189 
crystalline matter attached to them—often by only a corner 
or small end of the crystal; spores hyaline, even, subglobose, 
15-17 X 11-14 y. 
Fruetifieations usually 3-6 mm. in diameter, sometimes 
1-2 em. 
On bark of trunks of living oaks, rarely on ash and maple. 
New York to Florida, westward to Missouri, in California, 
Mexico, and Jamaica. August to January. 
This species resembles A. disciformis of Europe very 
closely in aspect but differs from it in being chalk-white, in 
having the margin blackening on the under side, in being 
thicker, somewhat zonate within, containing much more сгув- 
talline matter, and in having thinner-walled, slenderer, more 
hyphal-like, and more heavily inerusted paraphyses which are 
not at all moniliform at the tips. The spores may prove 
minutely rough-walled; winter collections of this species are 
desirable. 
Specimens examined : 
Exsiccati: Ellis, N. Am. Fungi, 1206; Ell & Ev., N. Am. 
Fungi, 3208, under the name Stereum acerinum; Ell. & Ev., 
Fungi Col., 605; Ravenel, Fungi Am., 120; Ravenel, Fungi 
Car. 1:22: 
New York: Buffalo, G. W. Clinton. 
Pennsylvania: Bethlehem, Е. 4. Rau, in Ellis, N. Am. Fungi, 
1206. 
Maryland: Takoma Park, C. L. Shear, 1104. 
West Virginia: Nuttallburg, L. W. Nuttall, two collections, 
in Ell. & Ev., N. Am. Fungi, 3208, and in Ell. & Ev., Fungi 
Col., 605. 
North Carolina: Salem, Schweinitz (in Herb. Fries and in 
Curtis Herb.) ; Blowing Rock, С. Е. Atkinson, 4193, 4320; 
Chapel Hill, Н. В. Totten, comm. by W. С. Coker, Univ. of 
N. Car. Herb., 1377a (in Mo. Bot. Gard. Herb., 9057). 
South Carolina: Aiken, H. W. Ravenel, in Ravenel, Fungi 
Am., 120; locality not stated, H. W. Ravenel, Fungi Car. 
1:88 
Florida: Sands Key, R. A. Harper, 8 (in Mo. Bot. Gard. 
Herb., 54526). 
