1917] 
BURT—MERULIUS IN NORTH AMERICA 317 
54924); O’Fallon, W. Trelease (in Mo. Bot. Gard. Herb., 
4060). 
Arkansas: Batesville, E. Bartholomew, in Bartholomew, 
Fungi Col., 2844 (in Mo. Bot. Gard. Herb.); Bertig, W. 
Trelease (in Mo. Bot. Gard. Herb., 4076, 4084); Womble, 
W. H. Long, 19912 (in Mo. Bot. Gard. Herb., 8962). 
Oklahoma: Spiro, Е. Bartholomew, in Bartholomew, Fungi 
Col., 4437. 
Idaho: Priest River, W. H. Long, 19912 (in Mo. Bot. Gard. 
Herb., 10722). 
Washington: Seattle, W. A. Murrill, 154, 155 (both in N. Y. 
Bot. Gard. Herb.). 
Mexico: Jalapa, W. A. Murrill, 310 (in N. Y. Bot. Gard. 
Herb.); Orizaba, J. G. Smith (in Mo. Bot. Gard. Herb., 
4066). 
5. М. ambiguus Berkeley, Grevillea 1: 69. 1872; басс. 
Syll. Fung. 6: 416. 1888. 
Type: type distribution in Ravenel, Fungi Car. 1: 24. 
Fructification orbicular, sometimes resupinate, usually nar- 
rowly reflexed, coriaceous-soft, with the reflexed portion 
tomentose, often concentrically suleate, drying whitish to pale 
smoke-gray; hymenium drying from tawny olive to Rood’s 
brown, the folds at first radiate, flexuous, and 
branching, then transversely connected and эс 
forming shallow, angular pores about 1X4 Fig. 5 
mm.; in structure 300-600 м thick, with (1) the м. ambiguus. 
layer next to the substratum 50-100 р thick, Spores X 870. 
5 я pl. 20, f. 4. 
composed of loosely interwoven, hyaline 
hyphae, and with (2) a much broader gelatinous layer bear- 
ing the hymenium and constituting the rest of the fructifica- 
tion; spores hyaline, even, 4-52-24 и. 
Fructifications 2-6 cm. in diameter, often laterally conflu- 
ent, the reflexed margin 2-10 mm. broad. 
On bark of logs of Pinus palustris, P. ponderosa, P. 
echinata, P. austrica, P. resinosa, ete. New Jersey to New 
Mexico and in Minnesota and Idaho. May to November. 
This fine species is intermediate between M. corium and 
