1918] 



BURT THELEPHORACEAE OF NORTH AMERICA. X 339 



H. ungulata is unique in our species of this genus by its 

 small, hoof-shaped fructifications with ashy white hymenium 

 and crust-like, dull black upper surface. The fructifications 

 are so hard that they turn the edge of the razor immediately 

 in sectioning and have not afforded good preparations for 

 showing the structure above the setigerous layer. H. ungulata 

 probably belongs in the group with H. corticolor. 



Specimens examined: 

 Mexico: Jalapa, W. A. & Edna L. Murrill, 176, type (in N. Y. 



Bot. Gard. Herb., and in Mo. Bot. Gard. Herb., 44970). 



17. H. corticolor Berk. & Ravenel, Grevillea 1 : 165. 1873; 

 Cooke, Grevillea 8 : 147. 1880; Sacc. Syll. Fung. 6 : 595. 1888; 

 Massee, Linn. Soc. Bot. Jour. 27 : 111. 1890. 



Type : type distribution in Ravenel, Fungi Car. 3 : 30. 



Fructifications hard, woody, 

 either wholly resupinate, adnate, 

 and following the inequalities of 

 the substratum, or with the 

 upper edge thickened, barely re- 

 flexed, black, glabrous ; hymc 

 drab, even; in structure 

 1000 II thick, lacking an interme- 

 diate layer, with the setigen 

 layer constituting the whole 

 thickness of the fructification 

 and composed of densely ar- 

 ranged, suberect, interwoven, 

 pale hyphae, much crystalline 

 matter, and scattered setae; Fig. u 



setae 60-75x9 n, emerging up to ' h. corticolor. 



45 II, sharp-pointed, distributed ^'''^'L^pf i^.^H '^^'* 



in all parts of the fructification; 



spores hyaline, even, flattened on one side, 4^X3^ ^u- 



Resupinate over areas 1-3x1 2-5 cm., with reflexed margin 

 1-1^ mm. broad. 



On bark, often in its crevices, of living trunks of oak, elm, 

 Magnolia, and other f rondose species. New Jersey to Florida, 

 and in Cuba, Jamaica, and Grenada. Autumn to February. 



