10 



Mycologia 



ently well-developed and matured part of the hymenium, as are 

 also the basidia, but on examining the forming tubes on the mar- 

 ginal growth a number of spore-like bodies, the counterparts of 

 the spores found in fresh American collections, were encountered. 

 They were not attached to basidia, but in all probability represent 



Fig. 6. a, Thick-walled hyphae characteristic of P. nigrescens ; b, Spores; 

 c, Basidium with 4 spores. 



the spores of the specimen. In practically all cases basidia and 

 spores are uniformly absent from the tubes of well-developed 

 specimens (PI. I, figs. 1-2). 



Bresadola's specimens were said to have grown on the wood of 

 Abies pectinata, a coniferous substratum, while all American col- 

 lections so far examined have been from the wood of deciduous 

 trees. 



Dr. Murrill 1 considers this plant not specifically distinct from 

 P. undata (Pers.) Bres., and gives, among others, P. odora Peck 

 and Polyporus broomei Rab. as synonyms. P. odora was recently 

 described 2 by myself as having allantoid spores which would re- 

 move the possibility of its being connected with the present 

 species. Since the publication of Dr. Murrill's opinion I have re- 

 examined specimens from Peck's types and have thoroughly con- 

 vinced myself that my former statement was correct. I have 

 found abundant allantoid spores attached to 4-sterigmate basidia. 

 As previously stated, the older parts of the hymenium in this col- 

 lection are not in sporulating condition, but toward the margin of 



1 Mycologia 13: 87. 1921. 



2 Bui. N. Y. State Mus. 205-206: 97-99- 1919- 



