[Vor. 4 
318 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
M. tremellosus; it resembles the former in general aspect and 
thin fructifications, which are, however, finally much larger 
than in that species, not quite so soft, with much larger and 
more rectangular pores, and with the subhymenial layer com- 
posed of hyphae having their walls gelatinously modified. 
The large pores and the gelatinous subhymenial layer are sug- 
gestive of M. tremellosus, but the fructification of M. ambiguus 
is thin and somewhat pliant when dry and softens upon ap- 
plying water so that it may be sectioned at once, and the 
spores are a little longer, broader, and not as curved as those 
of M. tremellosus; with a single exception, it has been col- 
lected so far on species of pine, while M. tremellosus is usually 
common on frondose species. 
Specimens examined: 
Exsiecati: Ellis, №. Am. Fungi, 925; ЕШ. & Ev., №. Am. Fungi, 
3205; Ravenel, Fungi Car. 1: 24, type distribution under 
the name Merulius fugax; Ravenel, Fungi Am., 217. 
New Jersey: Newfield, J. B. Ellis, in Ellis, М. Am. Fungi, 925, 
and in Ell. & Ev., N. Am. Fungi, 3205. 
South Carolina: H. W. Ravenel, in Ravenel, Fungi Car. 1: 
24; Society Hill, M. A. Curtis, 2399 (in Curtis Herb.). 
Georgia: Darien, H. W. Ravenel, in Ravenel, Fungi Am., 217. 
Florida: Mrs. H. Russell (in N. Y. Bot. Gard. Herb.) ; on 
Quercus, De Funiak Springs, W. H. Long, 18566 (in Mo. 
Bot. Gard. Herb., 54986). 
Texas: Quitman, W. Н. Long, 12062 (їп Mo. Bot. Gard. Herb., 
54925, and in N. Y. Bot. Gard. Herb.). 
Michigan: Sailor’s Encampment, E. T. Ф S. A. Harper, 897. 
Minnesota: Cass Lake, J. R. Weir, 8004 (in Mo. Bot. Gard. 
Herb., 54931). 
Arkansas: Womble, W. H. Long, 19810, 19862 (in Mo. Bot. 
Gard. Herb., 8631 and 15957, respectively). 
Idaho: Grangeville, J. R. Weir, 8001 (in Mo. Bot. Gard. 
Herb., 54929). This specimen is referred to M. ambiguus 
with some doubt. 
New Mexico: Pecos National Forest, W. H. Long, 21260 (in 
Mo. Bot. Gard. Herb., 54932) ; San Mateo Mountains, W. H. 
Long, 19579 (in Mo. Bot. Gard. Herb., 54928); Tejano Ex- 
