203 



plant and so gave to the species an adequate characterization. 

 In the same year the writer received specimens of the plant from 

 Dr. Kauffman and included the species in a manual* then ready 

 for the press. The species was not included in the recent man- 

 uals prepared by Dr. Murrill. 



As far as known the three collections previously mentioned were 

 the only ones made up to the close of the year 1915. In July, 

 191 6, Mr. A. S. Rhoads, of the New York State College of Fores- 

 try, collected it in abundance on a beech log at Cranberry Lake, 

 New York. As many as three or more additional collections 

 were made by Rhoads in the latter part of 1916, some of them on 

 logs of Acer riibriim, the habitat of the type collection. Abun- 

 dant specimens from these collections have been supplied the 

 writer and a limited amount of material is available for purposes 

 of exchange. Mr. Lloyd also reported receiving some additional 

 collections within the past year, and one or more collections are 

 in the herbarium of the New York Botanical Garden under 

 P. radiatus. When once known well developed specimens need 

 not be confused with P. radiatus, even without reference to the 

 internal structure. In the summer of 1916 the type specimens 

 at Albany were studied and other collections agree with them in 

 all essential details. 



The facts concerning the characteristic internal structure of the 

 plant can be easily gathered from the illustrations submitted in 

 this paper. Embedded in the internal tissue (trama) of the 

 walls of the tubes are large, brown, thick-walled hyphae that 

 vary up to i^n in diameter and run parallel to the long axis of the 

 tubes (Fig. 2). In longitudinal section of the hymenium they 

 are readily made out but can never be traced to their origin. The 

 reason for this will be apparent later. These hyphae usually 

 end blindly and are largest just before they taper to the apex, as 

 will be seen in the illustration (Fig. 5). In rare cases they pro- 

 ject obliquely into the lumen of the tubes from between the basi- 

 dia, but are not to be confused with the true setae that are also 

 present at times. Those are of much smaller size and protrude 

 from between the basidia at right angles to the tube axis. 



* The Polyporaceae of the Middle Western United States, p. 51, 1915. 



