[Vol. 2 



688 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



forms but usually soon irpiciform; spores cylindric or allan- 

 toic!, hyaline, 5-6 X 1.5-2.5 /*; cystidia present or inconspicu- 

 ous, hyaline, rarely incrusted at the apex, 4-5 /* in diameter, 

 projecting 5-15 n; hyphae of context hyaline, 4-5 /* in 

 diameter. 



On wood of deciduous trees. 



Illustrations : Freeman, PL Dis. /. 36.— Hard, Mushrooms, 



345. 



Specimens examined 1 : Barth. Fung. Col. 2825, 2924 (as 

 Coriolus prolificans) .—Ell. N. Am. Fung. 312.— Ell. & Ev. 

 Funs. Col. 302.— Eav. Fung. Am. 423, 108 (as Irpex fusco- 



5. VUl. KJ\JiU. J-VCIV. J- M..HJ-, 



violaceus).— Rav. Fung. Car. I, 13.— Rab.-Wint. Fung. Eur. 

 3331.— Shear, N. Y. Fung. 38.— Thuem. Myc. Univ. 1102 (as 

 P. pseudopargamenus). — Mo. Bot. Gard. Herb. 4086 (Mis- 

 souri), 4431 (Arkansas), 3855 (New York), 4443 (Indiana), 

 4439 (Kentucky), 4433 (Illinois), 4436 (Alabama), 4559 

 (Georgia), 4557 (Florida), 42875 (New Hampshire).— Burt 

 Herb, (collections from Pennsylvania, Vermont, Kansas, and 

 Massachusetts).— Overholts Herb. 476, 269, and others (Ohio), 

 1756 (Colorado). 



POLYPORUS ADUSTUS WlLLD. EX FRIES, P. FUMOSUS PeRS. EX 



Fries, P. fragrans Peck, and Related Species 



Perhaps no species have been more confused in American 

 mycology than these three, together with a few other closely 

 related forms both of Europe and America. They all agree 

 in the one character of having a hymenium that usually be- 

 comes more or less smoke-colored at maturity. In P. adustus 



and its closest relatives, P. crispus Fries and P. Burtii Peck, 

 the hymenium is usually black or grayish black from the first, 

 while in P. fumosus and P. fragrans it frequently becomes 



1 Ell. & Ev. Fung. Col. 804, distributed as P. pargammus, is P. hirsutus 

 (certainly not P. pubescens as stated by Lloyd, Letter No. 52, p. 20). Ell. & Ev. 

 N. Am. Fung. 1 ( ,)34, distributed as P. pargatneinis, is not tliis species. The ap- 

 pearance of the plant suggests a form of Irpex tulipifera. I have made a micro- 

 scopic study of the hymenium of the specimen and I find it has the larger in- 

 crusted cystidia of that species and not the inconspicuous cystidia of P. parga- 

 menus. Mycological literature contains several names for plants closely related 

 to, if not identical with, Irpex tulipifera and until the limits of the species are 

 better known the writer hesitates to refer the above specimen with certainty. 



