THE BOLETACEAE OF NORTH AMERICA— II 



William A. Murrill 



Most of the genera of the Boletaceae were treated in the first 

 part of this article, which appeared in the January number of 

 Mycologia. The remaining genus includes a comparatively 

 large number of species, many of which are rather difficult to 

 distinguish. Owing to the perishable nature of these plants, there 

 are also many doubtful species. For other recent papers on 

 this group, the student is referred to Torreya 8: 50-55, 197-200, 

 209-217. 1908, and to the Bulletin of the Torrey Club 35 : 517-526. 

 pi. 36-40. 1908. The last two articles, on " Boleti from Western 

 North Carolina " and " The Boleti of the Frost Herbarium," were 

 reprinted as Garden Contributions 111 and 114. 



II. Ceriomyces Battar. Fung. Hist. 62. pi. 29. 1755. 

 Not Ceriomyces Corda. 1837 



Leccinum S. F. Gray, Nat. Arr. Brit. PI. 1 : 646. 182 1. (Type 



species, Boletus aurantiacus Bull.) 

 Tubiporus Karst. Rev. Myc. 3 9 : 16. 1881. (Type species, Tubi- 



porus edulis (Bull.) Karst.) 

 Krombholzia Karst. Rev. Myc. 3 9 : 17. 1881. Not Krombholzia 



Rupr. 1842. (Type species, Krombholzia *ver sip ellis (Fr.) 



Karst.) 



Ver sip ellis Quel. Ench. Fung. 157. 1886. (Type species, Ver- 



sipellis variegata (Sw.) Quel.) 

 Ixocomus Quel. Myc. Fl. Fr. 411. 1888. (Type species, Ixo- 



comus badius (Fr.) Quel.) 

 Xerocomus Quel. Myc. Fl. Fr. 417. 1888. (Type species, Xero- 



comus impolitus (Fr.) Quel.) 



Hymenophore annual, terrestrial, centrally stipitate; surface 

 dry, rarely viscid, glabrous or variously ornamented: context 

 usually white or yellow, sometimes tinged with certain other 

 colors, very rarely poisonous; tubes free or adnate, small, cylin- 

 drical, sometimes large and angular near the stipe : spores oblong- 



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