1915] 



OVERHOLTS STUDIES IN THE POLYPORACEAE 



697 



P. chioneus, P. albellus, and P. lacteus. — P. chioneus 



described by Fries, 1 in ] 

 Europaei,' published in 187' 

 what more fully as follows 



815 



In his ' Hymenomycete: 

 t6). he described it some 



Albus, pileo 



molli 



laevigato, azono, postice s; epe porrecto, margine inflexo 

 poris curtis, exiguis, rotundi , aequalibus, integerrimis 



Ad truncos v. c. Betulae unciam latus, odore acido 



In 1878 Peck 2 described P. al >ellus from New York, also gro 



Peck eviden ly ' 

 he regarded his 



not 



acquainted with P. 

 species as probably more 

 us Fries and P. betulinus Bull, 

 difference in the descriptions of 



ing on birch. 



chioneus, but 



closely related to P. parado 



ex Fries. The only points o 



P. albellus and P. chioneus 



being described as ' ' two to 1 )ur inches broad, one to one and 



a half thick," and (b) in pub scence, the pileus being " smooth 



or sometimes slightly rough med by a slight strigose tomen- 



are: (a) 



Peck 



turn 



>> 



Both descript 



the soft context, white 



and "acid" odor. S* ccardo 3 has listed P. albellus 



a synonym for P. betulinus, and while the general form and 

 size of the two species is at times somewhat similar, it does 

 not require close observatio: . to distinguish them. The same 



Murrill 4 has 

 expressed the 



cannot be said of P. albellu > and P. chio 



ms 



d the writer has 



listed them 



same opinion in a recent pa >er. 5 



P. lacteus may well be bi mght into the discussion at this 

 point. It was described in ] 321. The description and figure 6 



call for a plant similar in i ize and habit to P. chioneus but 

 differing from that species md from P. albellus in having a 

 decidedly pubescent pileus a id a lacerated and labyrinthif orm 

 hymenium. These characte s should be sufficient to separate 

 at once P. lacteus from the >ther two species, and the writer 

 can neither accept nor undei stand the determinations of those 

 who would refer our commo i plant with a glabrous pileus and 



^bs. Myc. 1: p. 125. 1815. 



a Rept. N. Y. State Mus. 30: p. 15. 1878. 



a 



Syll. Fung. 6: p. 139. 1888. 



*N. Am. FT. 9: p. 35. 1908. 



e Ann. Mo. 13ot. Gard. 1 : p. 97. 1'J14. 



•Fries, E. Ic. Hym. 2: pi. 182. f. 1. 



