600 Murrill: Polvporaceae of North America 



Inonotus radiatus Karst. Rev. Myc. 3: 19. 1881. 



This species was first described from specimens collected on a 

 decaying stump in Sussex, England. In the description, Sowerby 

 refers to its habit of emerging from the substratum in a small 

 woolly mass and then growing in a radiating manner with this 

 mass as a center. He describes the pileus as zoned, with yellow 

 margin, and the texture as woody. Berkeley mentions hazel 

 stems as its favorite host in England. In Sweden it is abundant 

 on hazel and birch, while in Germany and Austria it is found 

 mostly on alder, which last is its most common host in America. 



The form found on a prostrate sugar maple trunk and described 

 as P. glomeratus by Peck, in 1873, hardly differs sufficiently from 

 the typical form to constitute a distinct species. With the two 

 forms before me, I can find no specific distinguishing character 

 either with the unaided eye or with the microscope. This similar- 

 ity was long since noticed and published by Cooke. The relations 

 of Polyporus scrobiculatus, and various forms included in Inonotus 

 radiatus by Karsten, to the typical form of this species do not 

 come within the scope of the present paper. 



Specimens are at hand from England, Plowright ; Berlin, 

 Magnus, Hennings; Tyrol, Brcsadola; Sweden, Murrill; Canada, 

 Macoun ; Connecticut, Underwood; New York, Peck, Parle. 



10. Inonotus amplectens sp. nov. 



Pileus hemispherical, clasping, concave beneath, 1-3 cm. in 

 diameter, 1-2 cm. thick ; surface soft, velvety, dark yellowish 

 orange, margin at first obtuse, entire, straw-colored, becoming 

 thin, undulate or toothed, deflexed and concolorous : context soft, 

 spongy-fibrous, ferruginous ; hymenium at first honey-yellow, be- 

 coming umbrinous, tubes 2-4 mm. long, 2-4 to a mm., larger by 

 confluence, umbrinous within, mouths at first closed by a yellow- 

 ish membrane, subcircular, regular, entire, becoming large, irreg- 

 ular, coarsely toothed and concentrically split into irpiciform 

 plates; spores ellipsoidal, smooth, hyaline, 1-2-guttulate, 4 x 6 ;/.. 



Type specimens of this plant were collected by R. M. Harper, 

 iggoa, on the Ocmulgee river near Lumber City, Georgia, Sept. 

 11, 1903. The fruit-bodies were found encircling living twigs of 

 Asimina parviflora (?). The upper surface of the plant resembles 

 Inonotus fruticum (B. & C), but the hymenium is very distinct. 



