1920] 
BURT—THELEPHORACEAE OF NORTH AMERICA. XII 135 
S. saxitas resembles in aspect S. Murrayi, and relationship to 
this species is further shown by the presence of vesicular organs; 
however, it is thicker than S. Murray?, stony-hard throughout, 
contains but few vesicular cells, and has subglobose spores. Its 
strueture is so extremely hard that it has been possible to cut 
sections for microscopic details of only the hymenium and 
nearly adjacent regions even after prolonged soaking in water. 
Specimens examined: 
Mexico: Guernavaca, W. A. & E. L. Murrill, 419, type, comm. by 
N. Y. Bot. Gard. Herb. (in Mo. Bot. Gard. Herb., 54552). 
Jamaica: John Crow Peak, D. S. Johnson (in N. Y. Bot. Gard. 
Herb., Mo. Bot. Gard. Herb., 56758, and Burt Herb.). 
37. S. styracifluum Schweinitz, Naturforsch. Ges. Leipzig 
Schrift. 1: 105. 1822 (under B. Sterea of Thelephora); Fries, 
Epier. 549. 1838; Sacc. Syll. Fung. 6: 569. 1888. 
Plate 4, figs. 34, 35. 
Thelephora styraciflua Schweinitz in Fries, Elenchus Fung. 
1: 177. 1828; Schweinitz, Am. Phil. Soc. Trans. N. S. 4: 167. 
1832. 
Type: in Herb. Schweinitz and portions in Herb. Fries and 
Curtis Herb. "" 
Fructification coriaceous, resupinate and effused, with a nar- 
row, free marginal portion, or slightly reflexed, tomentose, dry- 
ing pinkish buff to cinnamon-buff; 
hymenium dull, pruinose, not mul- 
tizonate, drying pinkish buff, exud- 
ing a yellow milk when compressed 
and becoming dark-discolored, con- 
tracting in drying and splitting; in 
structure 700-800 u thick, with the 
intermediate layer bordered on its 
upper side by a pale golden zone 
not denser than the rest of the : 3 A 
layer, composed of very densely a: Mr cabra 
arranged hyphae 23-3 un in diam- conducting organs. From type. 
eter, with pale-colored conducting 
organs 3-33 „in diameter which curve into the hymenium; no 
cystidia; spores hyaline, even, slightly curved, 5-8X 25-3 u. 
