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. Murrayi, stony-hard throughout, 

 contains but few vesicular cells, and has subglobose spores. Its 

 structure 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, 

 Epicr. 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 1* thick, with the 

 intermediate layer bordered on its 

 upper side by a pale golden zone 

 not denser than the rest of the 

 layer, composed of very densely 

 arranged hyphae 2|-3 n in diam- 

 eter, with pale-colored conducting 



organs 3-3^ n in diameter which curve into the hymenium; no 

 cystidia; spores hyaline, even, slightly curved, 5-8X2|-3 m- 



Fig. 17. S. styracifluum. Section 

 of hymenial region X 488, showing 

 conducting organs. From type. 



