[From the Bulletin of the Torrky Botanical Club, 31 : 415-428. Aug., 1904 ] 



The Polyporaceae of North America— VIII. Hapalopilus, Pycnoporus, 



and new monotypic genera 



William Alphonso Murrill 



HAPALOPILUS Karst. Rev. Myc. 3: 18. iSSr 



This genus was established upon a single species, H. nidulans 

 (Fr.), the chief distinguishing characters being an anodenn surface 

 and fleshy-tough context. In his work on Finland basidiomycetcs 

 published in 1889 Karsten reduces Hapalopilus \.o a subdivision of 

 the genus Inonotus, throwing white-spored and brown-spored 

 forms together. The forms treated under this genus in the pres- 

 ent paper are all white-spored, with anoderm, variously marked 

 surface and corky substance. The prevailing color is some shade 

 of brown, the context usually being ferruginous. All the species 

 are dimidiate, sessile and imbricate and grow upon decaying wood. 

 H. sublilacinus differs from the other species in growing upon con- 

 iferous instead of deciduous wood. 



In distribution the species differ widely. H. rutilans occurs 

 rather abundantly in the temperate regions of North America and 

 Europe, H. giknts is exceedingly common throughout North 

 America in both temperate and tropical regions and H. licnoidcs is 

 a common tropical American species. The other three are as yet 

 known only from their type localities, which are southern. A very 

 evident line of division exists between H. rutilans and the other 

 species, which latter bear distinct evidence of recent common 

 origin. When the great variability of H. gilvus is taken into con- 

 sideration, it appears to be only a question of a comparatively 

 short time before several new species will be evolved. 



415 



