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 erust-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 setigerouslayer. 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; Sace. Syll. Fung. 6 : 595. 1888; 
Мо, Linn. Soc. Bot. Jour. 27: 111. 1890. 
Туре: type distribution in Ravenel, Fungi Car. 3: 30. 
Fruetifieations hard, woody, 
either wholly resupinate, adnate, qu 
and following the inequalities of 
the substratum, or with the (s ШИШ le 
upper edge thickened, barely re- КУД К, 
flexed, black, glabrous; hymenium (ЛЫП 
drab, even; іп strueture 400- d visi uH d 
1000 д thick, lacking an interme- pl Jd И 
diate layer, with the setigerous 4 
layer constituting the whole po 
и 
| 
Eis ү 
in, 
2] 
thickness of the fructification "n PR ier m A 
and composed of densely ar- ү ily; и i is и 
ranged, suberect, interwoven, 590920900 DAS foi 
pale hyphae, much crystalline 463575756525 
matter, and  seattered setae; Fig. 14 
setae 60-759 u, emerging up to , H. corticolor. 
45 и, sharp-pointed, distributed Midi te "n type. 
in all parts of the fructification; 
spores hyaline, even, flattened on one side, 4434 y. 
Resupinate over areas 1-31}-5 cm., with reflexed margin 
1-14 mm. broad. 
On bark, often in its crevices, of living trunks of oak, elm, 
Magnolia, and other frondose species. New J ersey to Wiorida, 
and in Cuba, Jamaica, and Grenada. Autumn to February. 
