THE POLYPORACEAE OF WISCONSIN. 75 



grew on a tamarack stump, was 12 cm. long, 13 cm. wide and 13.5 

 cm. thick, and was composed of 22 strata of tubes, the average thick- 

 ness of each stratum being about 6 mm. 



It seems to me that F. pinicola (Swartz) and F. pini-canadensis 

 Schw. should be treated as above. Their characters are certainly not 

 definite enough to be distinctive of species. Whether they indicate the 

 existence of well marked varieties is perhaps also a question. 



Fomes marginatus Fries No. 1204 of Fungi Columbiani E. & E., is 

 what we have identified as the resupinate form of F. ungulatus. Schaef- 

 fer's figures (27, tab. 137) agree quite well with our specimens of 

 F. ungulatus, especially with the variety pinicola. 



Murrill (19, 32, p. 487) makes F. pini-canadensis Schw. a synonym 

 of F. PUotae of the same author. However, we have specimens which 

 agree well with the description of F. PUotae which grow on much de- 

 cayed wood of deciduous trees, and specimens which agree with the de- 

 scription of P. pini-canadensis which were found on pine. The two 

 types appear to be widely different. 



Syn. : Boletus ungulatus Schaeff. ; 27, 2, taf . 137, not 138. 

 Boletus fulvus Schaeff. ; 27, 3, taf. 262. 

 Fomitopsis pinicola (Swartz) Karst. pr. p. ; 13, 3, p. 18 (1881.) 



Fomes marginatus (Fr.) (PL VI, fig. 25). 



Pileus suberose-lignose, subapplanate, covered with a rind, concen- 

 trically sulcate, glabrate but grayish-pruinose, margin pallid, of vari- 

 ous colored zones, alutaceous within; pores round straw-colored, when 

 rubbed turning reddish. 



Saccardo gives the following substrata for this form : ' ' On oak trunks, 

 beech, birch, pine, etc., in Europe and near Conception, Uruguay, 

 South America." Fries says the pileus gets a different-colored zone 

 every year; the first is whitish-gray; the second tawny-bay, the third 

 blood-red; older zones are blackish. 



The specimens which we include here are large explanate, concen- 

 trically sulcate, rugose and glabrous. The colors are very characteristic ; 

 the most recent growth pale yellowish; this is followed by a broad 

 bright red zone and this in turn in the most rapidly grown specimens 

 by a dark purple-red zone. The older parts are grayish-black. The 

 substance and the tubes are pallid or straw-color as in the preceding 

 species. The young margin and tubes turn pale flesh-color when 

 bruised, as do also those of F. ungulatus and its varieties. Largest 

 pileus 35 cm. wide, 28 cm. long and 8 cm. thick. One specimen, con- 



