1920] 
BURT—THELEPHORACEAE OF NORTH AMERICA. XII 189 
truding up to 120 ,, starting from all parts of the hymenial 
layer and subhymenium; basidiospores as seen on basidia, 
hyaline, even, 9-13X(3-41 u, borne 4 to a basidium. 
Reflexed portions 1-4 em. long and wide, sometimes laterally 
confluent for 6-8 cm.; resupinate parts of about the same 
dimensions. 
On dead Abies, Picea, Pinus, and Larir. 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 Murrayana; 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). 
