1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 327 



S. Underwoodii Burt, n. sp. 



An Stereum induratum Berkeley, Linn. Soc. Bot. Jour. 16: 44. 

 1877? 



Type: in Burt Herb. 



Fructifications corky, not hard nor indurated, adnate, resupi- 

 nate and effused, sometimes narrowly reflexed, the reflexed surface 

 drab in the herbarium where young, nearly black where oldest, 

 somewhat concentrically sulcate, fibrillose, not shining, the 

 margin entire; hymenium warm buff to honey-yellow in the 

 herbarium, even, velutinous; in section 3^-2 mm. thick, colored 

 warm buff to tawny olive throughout, stratose, composed of 

 densely interwoven, colored, rigid hyphae l}^-2}/ \l in diameter, 

 highly branched and with many branches of more or less antler- 

 shaped form; no cystidia, gloeocystidia, conducting organs nor 

 imbedded spores; spores hyaline, even, 10 X5|i but may not 

 belong, only 1 seen. 



Fructifications effused over areas 6 mm. -5 cm. long, 6 mm.-2 

 cm. wide, the reflexed margin 2-3 mm. broad. 



On bark of Xolisima. West Indies and Brazil. September and 

 April. 



This species has the antler-shaped branching of hyphae char- 

 acteristic of Hypochnus pallescens, H. peniophor aides, Aster o- 

 stromella dura, and Stereum duriusculum. The narrowly re- 

 flexed margin is well shown by the specimens from Jamaica and is 

 important for location of S. Underwoodii in Stereum. The 

 Brazilian specimen was received from Bresadola under the name 

 Stereum induratum Berk. a species known only from a single 

 collection made by the Challenger Expedition in the East Indies 

 and described as pileate, conchiform, 3 inches across, and very 

 hard. S. Underwoodii is soft, not at all hard, and does not turn 

 the edge of the razor in sectioning. I have not yet been able to 

 study the type of S. induratum. 



Specimens examined: 

 Jamaica: base of John Crow Peak, L. M. Underwood, 21$2, type, 



comm. by N. Y. Bot. Gard. Herb.; Cinchona, L. M. Underwood, 



3128, comm. by N. Y. Bot. Gard. Herb. 

 Brazil: Blumenau, Dr. Mbller, comm. by Bresadola under the 



name of Stereum induratum. 



