rcd BURT—THELEPHORACEAE OF NORTH AMERICA. XII 221 
Fructifications 5-10 mm. in diameter, becoming confluent 
over areas 1-2 cm. wide and up to 12 cm. long, and reflexed 2-7 
mm. 
On wood and in crevices of the bark of dead limbs and logs of 
Eucalyptus, oak, pecan, and other frondose species. Oregon to 
Mexico. September to April. 
Resupinate specimens of S. heterosporum are not distinguish- 
able in aspect from the darkest colored specimens of S. alboba- 
dium; all specimens of the former which have been seen so far 
have been bister or seal-brown, which is also the color of the 
upper side of the pileus. Mature specimens of S. hetero- 
sporum differ from those of S. albobadium in the much thicker 
zonate hymenium which has cystidia in all parts of this layer 
and many wholly buried below the surface; the deeper region of 
the hymenium is dark-colored in the type because of the abun- 
dance of dark-colored hyphal ends which are occasionally in- 
erusted, and colored imbedded spores are as numerous as in 
Stereum rugisporum, which has nearly the same geographic 
range. Ihave not found colored imbedded spores in the collec- 
tion distributed in Ell. & Ev., Fungi Col., 1116, which I refer to 
S. heterosporum on account of other distinctive characters of this 
species. 
, Specimens examined: 
Exsiccati: Ell. & Ev., Fungi Col., 1116, under the name Stereum 
albobadium. 
Oregon: Portland, C. J. Humphrey, 6125. 
California: Berkeley, C. J. Humphrey, 5981; Campo Mts., 
C. R. Orcutt, 2007, 2008, comm. by U. S. Dept. Agr. Herb.; 
Compton, A. J. McClatchie, in Ell. & Ev., Fungi Col., 1116, 
and (in N. Y. Bot. Gard. Herb., Burt Herb., and Mo. Bot. 
Gard. Herb., 56769); Claremont, D. L. Crawford, 1518, 
comm. by L. O. Overholts, 3325 (in Mo. Bot. Gard. Herb., 
21688); Santa Cruz, Dr. Anderson, comm. by W. G. Farlow. 
Arizona: Coronado National Forest, G. G. Hedgcock & W. H. 
Long, comm. by C. G. Humphrey, 2562, 2563 (in Mo. Bot. 
Gard. Herb., 13070, 12811). 
ka Parral, Chihtualum. E. O. Matthews, 3, and 27, type 
n Mo. Bot. Gard. Herb., 44282, 44420, 44106); Rosario, 
E. O. Matthews (in Mo. Bot. Gard. Herb., 44110). 
