Murrill: Poi.yporaceae of North America 33 



4. PoLVPORUS DELicATUS B. & C. Grevillca, i : ij . 1872 



Only one small plant of this species is to be found in the Kew 

 herbarium. It was collected in Alabama by Peters, growing on 

 decaying wood. It is uniformly ochraccous in color, tomentose, 

 of soft elastic substance, with a thin undulate revolute margin. 

 The tubes are angular, 2 to a mm., decurrent even to the base and 

 quite collapsed when dry. The stipe is central and radicate, and 

 the buried portion is darker in color than the rest. At first 

 sight, the surface suggests Polyporus fractipcs, the color being 

 very similar in both, but the central stipe, firmer substance and 

 much larger tubes q{ P. delicahis readily distinguish it from that 

 species. 



5. Polyporus dibaphus B. & C. Grevillea, i : 36. 1872 

 This plant resembles P. Polyporus in many respects, but its 

 pore structure appears to be different. It was collected by 

 Peters in Alabama on trunks of Ilex. The type at Kew is the 

 larger share of a single specimen cut in two. A better de- 

 veloped plant might show closer resemblance to P. Polyponcs. 

 One can never be entirely free from the suspicion that species 

 resting upon a slight material basis and closely resembling species 

 that are common and variable may possibly be only undeveloped 

 or depauperate or abnormal forms of the more abundant species. 

 It seems best, however, in the present instance to consider P. 

 dibaphus as distinct until its relationships are more clearly proved. 



6. Polyporus Polyporus (Retz) 



Boletus Polyporus Retz, Vet. Ac. Handl. 253. 1769. 



Boletus bruuialis Pers. Neues Mag. Bot. i: 107. 1794. 

 Batsch, Elench. Fung.//. 10, f. 42a. 1783. 



Boletus fasciculatus Schvdid. S'pxc. 154. 1794. 



Polyporus bruuialis Fr. Obs. Myc. 2 : 255. 181 8. 



Polyporus luridus B. & C. Grevillea, i : n . 1872. 



Polyporcllus brunialis Karst. Medd. Soc. P^aun. et. Fl. Fenn. 5 : 

 37. 1879. 



Polyporellus Polyporus Murrill, Jour. Myc. 9: 93. 1903. 



There are two forms of this widely distributed plant, both oc- 

 curring throughout Europe and North America. It was the yel- 



