Murrill: Polyporaceae of North America 95 



The above description indicates that the author was possibly 

 dealing with old and darkened specimens of Agaricus quercinus. 



Daedalea puberula B. & C. Grevillea I : 67. 1872. Described 

 from plants collected in Pennsylvania by Michener as follows : 



" Pileo molli-suberoso, irregulari, dimidiato, hie illic tuber- 

 culoso, puberulo, ochraceo ; margine tenui : poris parvis demum 

 sinuatis." 



" About 4 inches across ; irregular, corky, of a soft substance, 

 which is slightly zoned, attached behind, and more or less decur- 

 rent, even, with the exception of a few obtuse, tubercular, eleva- 

 tions, finely pubescent; ochraceous ; pores about 1/50 inch 

 across, sinuated; of the same colour as the pileus." 



LENZITES Fr. Gen. Hymen. 10. 1836 

 This genus, dedicated to Lenz, was described by Fries as 

 follows : 



" Lamellae coriaceae, radiantes, nunc simplices, nunc poroso- 

 anastomosantes, acie compaginatae ; dissepimento pileo floccoso." 

 Fries lists only three species, L. betulina, L. abietina and L. 

 heteromorpka, the first of which we consider the type. As at 

 present limited, the genus contains only two North American 

 species, one very abundant in the United States and Canada and 

 the other known only from Cuba. 



Synopsis of the North American species 



Surface of the pileus conspicuously tomentose. I- L. betulina. 



Surface of the pileus finely pubescent. 2. L. cubensis. 



i. Lenzites betulina (L.) Fr. 

 Agaricus bctulimts L. Sp. PL 11-/6. 1753. — Sowerby, Eng. 



Fung. pi. 182. 1799. 

 Daedalea betulina Rebentisch, Prodr. Fl. Neom. 371. 1804. — 



Fr. Obs. 1 : 104. 18 15. 

 Lenzites betulina Fr. Gen. Hymen. 10. 1836. 



Linnaeus describes this species as " Agaricus acaulis coriaceus 

 villosus : margine obtuso, lamellis ramosis anastomosantibus." 

 " Fl. Suec. 1085. Habitat in Betulis." Later botanists also de- 

 scribed it under various other names. The plant is exceedingly 

 common and is so well known as to need no description, being 

 found in abundance on old stumps, fallen branches and other 



