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BURT—THELEPHORACEAE OF NORTH AMERICA. XII 181 
arranged, dark-colored, thick-walled, stiff hyphae 31-41 , in 
diameter, not incrusted, which give their color to the fructifica- 
tion; no colored conducting organs, gloeocystidia, nor cystidia; 
spores hyaline, 9X4 y. 
According to the original collection of 3. crassum in Herb. 
Fries, this is a very distinct species, characterized by very dark 
color throughout and by absence of colored conducting organs, 
cystidia, and gloeocystidia. It is probably of local distribution, 
for I have seen but one collection which is even doubtfully 
referable to SS. crassum. This specimen, collected at Motzo- 
rongo, is wholly resupinate, with hyphae dark-colored and 
ascending obliquely from the substratum instead of running 
longitudinally, and the hymenium has dried pinkish buff. 
Specimens examined: 
Mexico: Mirador, Liebman, type (in Herb. Fries); Motzorongo, 
near Cordoba, W. A. & E. L. Murrill, 985 (in N. Y. Bot. 
Gard. Herb. and Mo. Bot. Gard. Herb., 54648). 
53. S. radiatum Peck, Buffalo Soc. Nas. Hist. Bul. 1:62. 
1873; N. Y. State Mus. Rept. 26:72. 1874; Sace. Syll. 
Fung. 6: 571. 1888; Massee, Linn. Soc. Bot. Jour. 27: 195. 
1890. Plate 5, fig. 53. 
5. radiatum var. reflerum Peck, N. Y. State Mus. Rept. 
49:45. 1896; Saec. Syll. Fung. 14:217. 1900.—An Thele- 
phora (Stereum) corrugata Léveillé, Ann. Sci. Nat. Bot. MI. 
5:150. 1846? 
Type: in N. Y. State Mus. Herb. 
Fructification coriaceous, resupinate, with the margin free all 
around, sometimes reflexed on the upper side, the reflexed por- 
tion becoming black above, velutinous, 
crisped, and somewhat lobed; hymenium 
uneven, not polished, marked with thick <= <> 
ridges radiating from the center, Sudan- c^ S 
brown, rarely black when turned upward Fig. 26. S. radiatum. 
and exposed to direct sunlight and weather; Spores X 665. 
in structure 1000 , thick, composed of 
densely and longitudinally arranged, colored hyphae 31-4 y in 
diameter, whose color is dissolved by dilute potassium hydrate 
solution; no cystidia; spores from spore collections white, 
even, slightly curved, 9-10X31-4 y. 
