[Vol. 7 

 190 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Colorado: Silverton, E. R. Hodson, comm. by C. J. Humphrey, 



1551; Tolland, L. 0. Overholts, 1781, 2336 (in Mo. Bot. 



Gard. Herb., 56042, 56761); Yankee Doodle Lake, F. J. 



Seaver & E. Bethel (in N. Y. Bot. Gard. Herb, and Mo. Bot. 



Gard. Herb., 56729). 

 Idaho: Bonanza, G. G. Hedgcock, comm. by C. J. Humphrey, 



2168 (in Mo. Bot. Gard. Herb., 10377); Coolin, J. R. Weir, 



11476 (in Mo. Bot. Gard. Herb., 56724); Leesburg, F. S. 



Wolpert, comm. by J. R. Weir, 7033 (in Mo. Bot. Gard. 



Herb., 55463); Priest River, E. E. Hubert, comm. by J. R. 



Weir, 11655 (in Mo. Bot. Gard. Herb., 56725). 

 British Columbia: J. Macoun, 94, type (in N. Y. Bot. Gard. 



Herb.). 

 Washington: Olympic Mts., T. C. Frye, 1 (in N. Y. Bot. Gard. 



Herb, and Mo. Bot. Gard. Herb., 56730); Seattle, W. A. 



Murrill, 130, 146 (in N. Y. Bot. Gard. Herb, and Mo. Bot. 



Gard. Herb., 56731, 56732) and J. M. Grant, 2066, comm. 



by C. G. Lloyd (in N. Y. Bot. Gard. Herb., 56728). 

 Arizona: Agassiz, W. H. Long, 19445 (in Mo. Bot. Gard. Herb., 



44734); Mt. Humphrey, Flagstaff, W. H. Long, 21306- 



21308, 21310 (in Mo. Bot. Gard. Herb., 54897-54899, 

 54901); Interior Basin, San Francisco Peaks, W. H. Long, 



21309, 21311 (in Mo. Bot. Gard. Herb., 54900, 54902). 



58. S. ambiguum Peck, N. Y. State Mus. Rept. 47: 145. 

 1894; Sacc. Syll. Fung. 11: 122. 1895. Plate 5, fig. 57. 



Type: in N. Y. State Mus. Herb. 



Fructifications coriaceous, dry, resupinate, effused, rarely nar- 

 rowly reflexed, with the upper side tomentose, Prout's brown, 

 the resupinate margin often brighter colored, antique brown, 

 determinate; hymenium velvety, raw umber to Saccardo's 

 umber when mature and thick, becoming deeply cracked in 

 drying; in structure 600-1400 n thick, with an intermediate 

 layer 400-600 m broad, composed of longitudinally interwoven, 

 colored hyphae 3-4 /* in diameter, and with a zonate hymenial 

 layer up to 800 n thick containing colored incrusted cystidia in 

 all the zones; sections darkened by KHO solution; cystidia 

 colored, cylindric, obtuse, usually incrusted, 100-150X7-12 11, 

 protruding up to 100 n; basidiospores white in spore collection, 



