1925] 



BURT THE THELEPHORACEAE OP NORTH AMERICA 341 



ture, often not cracked at all or, when cracked, into areas ranging 

 down to about 5 mm. in diameter. The fructifications of P. 

 pruinata are much thicker than those of P. cinerea and darker 

 throughout. When moistened, small pieces may be separated 

 from the bark for sectioning. 



Specimens examined: 

 Florida: Cocoanut Grove, R. Thaxter, 77 (in Farlow Herb., and 



Mo. Bot. Gard. Herb., 43897); Otter Creek, C. J. Humphrey, 



6703 (in Humphrey Herb.); Palm Beach, H. von Schrenk (in 



Mo. Bot. Gard. Herb., 43043). 

 Alabama: Montgomery County, R. P. Burke, 874 (in Mo. Bot. 



Gard. Herb., 57242). 

 Mexico: Motzorongo, near Cordoba, W. A. & E. L. Murrill, 988 



(in Mo. Bot. Gard. Herb., 54621); Orizaba, W. A. & E. L. 



Murrill, 764, in part, comm. by N. Y. Bot. Gard. Herb, (in 



Mo. Bot. Gard. Herb., 54635). 

 Cuba: C. Wright, 193, type (in Farlow Herb., and Kew Herb.); 



Alto Cedro, Santiago de Cuba Province, Earle & Murrill, 516, 



518, 544, ^55, comm. by N. Y. Bot. Gard. Herb.; Ceballos, 



C. /. Humphrey, 2815. 



Porto Rico : Mount Morales, near Utuado, Mrs. E. G. Britton & 



D. W. Marble, 1204, comm. by N. Y. Bot. Gard. Herb, (in 

 Mo. Bot. Gard. Herb., 61486). 



Jamaica: Hope Gardens, W. A. Murrill, 2, comm. by N. Y. 

 Bot. Gard. Herb.; Moneague to Union Hill, W. A. Murrill, 

 1176, comm. by N. Y. Bot. Gard. Herb. 



110. P. rimosissima (B. & C.) Burt, n. comb. 



Corticium rimosissimum Berkeley & Curtis, Am. Acad. Arts 

 & Sci. Proc. 4: 124. 1858; Sacc. Syll. Fung. 6: 639. 1888; 

 Massee, Linn. Soc. Bot. Jour. 27: 122. 1890. An Stereum 

 umbrinum Berk. & Curtis? 



Type : type distribution in C. Wright, Plants of U. S. North 

 Pacific Expl. Exp., 110. 



Fructifications broadly effused, rather thick, dry, mem- 

 branaceous, separable in rather large pieces, pliant when dry, 

 now bister in the herbarium, not shining, even, cracking through 

 the colored hymenium into polygonal masses 1-4 to a mm. and 



