1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 195 



Africa: Erhove, Zululand, P. A. van der Bijl, 26 (in Mo. Bot. 

 Gard. Herb., 58824); Houtbos, Transvaal, P. A. van der Bijl, 

 1482. 



13. C. tuberculatum Karsten, Hedwigia 35:45. 1896; Krit. 

 Ofvers. Finl. Basidsv. Tillag 3: 29. 1898; Sacc. Syll. Fung. 14: 

 221. 1899; v. Hohnel & Litschauer, K. Akad. Wiss. Wien Sitz- 

 ungsber. 115: 1561. 1906. 



Type : authentic specimen or part of type in Burt Herb. 



Fructifications orbicular or longitudinally effused, rather thick, 

 somewhat membranaceous, small pieces separable when moist- 

 ened, white at first, becoming light buff to warm buff in the her- 

 barium, somewhat colliculose or tuberculate, waxy, the margin 

 radiately fibrillose; in section 200-300 \l thick, not colored, with 

 the hyphae densely interwoven in a narrow layer next to the sub- 

 stratum and then ascending obliquely and not crowded to the 

 compact hymenial layer, 33^-4J^ {i in diameter, somewhat in- 

 crusted in the type, not nodose-septate; no gloeocystidia; spores 

 hyaline, even, 4-6 X 23^-3J^ \l, copious. 



Pieces of fructification 2% cm. in diameter in the specimen 

 seen. 



On bark and wood of fallen branches of Populus, Fraxinus, and 

 other frondose species. Finland, Pennsylvania to Wisconsin. 

 Rare. 



C. tuberculatum approaches Radulum in having a middle layer 

 of loosely arranged, ascending hyphae and a somewhat colliculose 

 surface and some small tubercules in the authentic specimen com- 

 municated to me by Karsten and which agrees closely with his 

 description of the species. The general aspect somewhat re- 

 sembles that of Peniophora mutata. The American gatherings 

 cited below have a more even hymenium and hyphae not in- 

 crusted and are doubtfully referred to C. tuberculatum. 



Specimens examined : 

 Finland: Mustiala, P. A. Karsten, probably part of type. 

 Pennsylvania: Trexlertown, W. Herbst, 77. 

 Michigan: East Tower, J. R. Weir, 370 (in Mo. Bot. Gard. Herb., 



17074). 

 Wisconsin : Madison, A. 0. Stucki, 44, comm. by Univ. Wis. Herb. 



