1920] 



BURT THELEPHORACEAE OF NORTH AMERICA. XII 189 



truding up to 120 m> starting from all parts of the hy menial 

 layer and subhymenium; basidiospores as seen on basidia, 

 hyaline, even, 9-13X3-4| /z, borne 4 to a basidium. 



Reflexed portions 1-4 cm. long and wide, sometimes laterally 

 confluent for 6-8 cm.; resupinate parts of about the same 

 dimensions. 



On dead Abies, Picea, Pinus, and Larix. In Rocky Mt. 

 states and British Columbia to Arizona. July to September. 



Reflexed specimens of S. rugisporum may be recognized by 

 their thick, felty, or spongy pilei, deeply concentrically sulcate, 

 and snuff-brown or partly gray in color, with a whitish, pruinose 

 hymenium, and an odor of anise; collections so far made indicate 

 that this species is restricted to conifers of mountainous regions. 

 Microscopic examination of sections shows characteristic cy- 

 lindric, colored cystidia, which in the subhymenium and the 

 deeper zones of the hymenium are not readily distinguishable 

 from such colored conducting organs as occur in many species 

 of Stereum. There is, however, no record of bleeding from 

 wounds of the hymenium of S. rugisporum and S. abietinum. 

 The type specimen of S. rugisporum contains colored spores, 

 usually even, but occasionally rough-walled, imbedded in the 

 deeper zones of the hymenium; similar spores occur in some, but 

 not all, of the collections cited below, but the collections are so 

 similar in other characters that I regard these colored imbedded 

 spores as an important, occasional character of the species, which 

 will positively identify some collections. 



The type of Hymenochaete fimbriata was collected in Yellow- 

 stone Park, Montana, on Pinus Murray ana; the specimen is 

 wholly resupinate and does not show colored, imbedded spores 

 in the preparations which I preserved. I regarded this specimen 

 as not specifically distinct from S. abietinum, but the type 

 station of H. fimbriata makes me uncertain as to whether the 

 latter may not yet be demonstrated to be resupinate S. rugis- 

 porum instead. When so demonstrated, the specific name 

 fimbriatum should be used for the species because of earlier 

 publication. 



Specimens examined: 

 Wyoming: Fox Park, J. R. Weir, 10009 (in Mo. Bot. Gard. 

 Herb., 55788). 



