191S] 



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, 

 15-17x11-14 /i. 



Fructifications usually 3-6 mm. in diameter, sometimes 

 1-2 cm. 



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 crys- 

 talline matter, and in having thinner-walled, slenderer, more 

 hyphal-like, and more heavily incrusted 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 : 32. 

 New York : Buffalo, G. W. Clinton. 

 Pennsylvania: Bethlehem, E. A. 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, G. F. Atkinson, 4193, 4320; 



Chapel Hill, //. R. Totten, comm. by W. C. 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. 



1:32. 

 Florida: Sands Key, R. A. Harper, 8 (in Mo. Bot. Gard. 



Herb., 54526). 



