1918] 



BURT THELEPHORACEAE OF NORTH AMERICA. IX 199 



branches are more or less abundant through the whole of the 

 fructification. 



Fructifications at first 2-3xl-li mm., becoming confluent 

 over areas 3-8 cm. X ^10 mm. 



On dead stems of Ruhus and Vitis. Massachusetts, Mary- 

 land, and Mexico. November to April. Rare. 



This species closely resembles in aspect and general details 

 of structure an authentic specimen of A, cerussatus in my 

 herbarium, but differs from the latter species chiefly in hav- 

 ing bottle-brush organs not confined to the hymenial surface 

 but distributed through the whole thickness of the fructifica- 

 tion; other less important differences are slightly larger 

 spores and basidia and much larger sterigmata, and less 

 widely effused fructifications. A, hotryosus resembles A, 

 nivosus somewhat in aspect but differs from it by having 

 bottle-brush paraphyses. Thelephora albidocarnea Schw., 

 originally collected on Vitis and to which I have referred in 

 my herbarium two scanty collections on Vitis, has aspect very 

 similar to A. hotryosus, but sectional preparations of T. cdhi- 

 docarnea do not show gloeocystidia and apparently have much 

 smaller basidia and spores. T. albidocarnea should receive 

 consideration when collections resembling A. hotryosus are 

 made on Vitis. 



Specimens examined: 

 Massachusetts: Sharon, A, P. D. Piguet, two collections (in 



Farlow Herb., and in Mo. Bot. Gard. Herb., 54774, 55277). 

 Maryland: Takoma Park, C. L. Shear, 1025, type, 1127, and 



1357. 

 Mexico : Jalapa, W. A. S Edna L. Murrill, 320 (in N. Y. Bot. 



Gard. Herb., and in Mo. Bot. Gard. Herb., 54497). 



11. A. cremeus Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb. 



Fructifications resupinate, effused, adnate, convex at first, 

 then confluent and plane, drying cracked and cream-buff, the 

 margin thick and entire ; in structure 600-800 /* thick, con- 

 taining much crystalline matter arranged in layers, with 

 hyphae suberect, interwoven ; hymenium composed of clavate 

 basidia, bottle-brush paraphyses 6-7 m in diameter, and of 



