1918] 



BURT THELEPHORACEAE OF NORTH AMERICA. X 331 



hyphae of the upper surface of the pileus by a narrow, dark, 

 dense zone; setae cylindric below, acute, 50-75X^10 Ht 

 emerging up to 50 n, starting from various parts of the dark 

 subhymenial zone, abundant but not crowded ; spores hyaline, 

 even, somewhat curved, 4-6x1-2 n, as seen in preparations 

 of sections. 



Fructifications with pilei 4^7 mm. long, 4-10 mm. broad, 

 sometimes laterally confluent; resupinate portions, when 

 present, |-2x2|-7i cm. 



On erect rotting stumps of frondose species — rarely on 

 prostrate logs. Canada to Carolina. June to January. Oc- 

 casional. 



This species is so closely related to H. tabacina that I have 

 been doubtful whether it is not a form of the latter some- 

 what modified in form of fructifications through growing on 

 a vertical surface. H. badio-ferruginea may be separated 

 from H. tabacina by growing upon a vertical surface and by 

 the small imbricated, conchif orm pilei which are thinner than 

 those of H. tabacina, and by the hymenium either not at all 

 cracked or with narrow cracks which do not form systems 

 radiating from several centers in the resupinate portion — 

 each system of cracks from its own center. The type of H. 

 badio-ferruginea was collected in New York by Menand. All 

 European specimens of H. tabacina which I have seen are 

 distinct also from H. badio-ferruginea in the characters enum- 

 erated above. 



Specimens examined: 

 Canada: Bushwood, J. Macoun, 115. 

 New Brunswick: Tobique River, G. N. Hay. 

 Maine: Piscataquis County, W. A. Murrill, 1941, 2232, 2246, 



2248 (in N. Y. Bot. Gard. Herb., and in Mo. Bot. Gard. 



Herb., 55515-55518) ; Penobscot County, W. A. Murrill, 



1807 (in N. Y. Bot. Gard. Herb., and in Mo. Bot. Gard. 



Herb., 55506). 

 New Hampshire: P. Wilson (in N. Y. Bot. Gard. Herb., and 



in Mo. Bot. Gard. Herb., 55519) ; Camp, Ellis R., U. & C, 



from Underwood Coll., 8 (in N. Y. Bot. Gard. Herb., and in 



Mo. Bot. Gard. Herb., 55502) ; White Mts., U. & C, 19, 



