The Agaricaceae of Ohio. 561 



Pileus dry, minutely tomentose ; lamellae subdistant. S. 

 1 139; A. 167; H. 289; Mc. 394. 



P. rhodoxanthus (Schw.) Atk. 



Notes. 



P. porosus Berk. (S. 991 ; M. 179) is usually known as Bole- 

 tinus porosus (Berk.) Peck. It is also known as Boletinellus 

 merulioides (Schw.) Murrill. N. Am. Flora 9^: 158. 



P. rhodoxanthus is difficult to place satisfactorily. It is 

 sometimes known as Gomphidius rhodoxanthus, but Gomphidius 

 has a glutinous universal veil, while this species is never glutin- 

 ous. Flammula, Phylloporus, and Boletinus have each been pro- 

 posed as the proper genus for it. P. fiavidus Berk. (S. 987; M. 

 179) is probably the same plant. 



BOLBITIUS FR. 



A.^ Pileus viscid when moist. 



B.^ Pileus striate or sulcate ; lamellae not decurrent. 



C.^ Young pileus pure white, sordid with age. Myc, 



Notes I :i8 B. sordtdus Lloyd 



C.^ Pileus not Avhite. 



D.^ Pileus sulcate, brown or brownish, 4-6 cm. ;: 

 lamellae free. S. 14: 156; Jour. Cin. Soc. Nat.. 



Hist. 18 : 36 B. radians Morg. 



D.- Pileus striate only, yellow, usually less than 4 

 cm.; lamellae adnexed. S. 1074; H. 346; St. 



362 B. fragilis (L.) Fr. 



B.^ Pileus not striate or sulcate ; lamellae decurrent. S. 1077. 



B. macrorrhizus B. & Mont. 

 A.^ Pileus not viscid. 



B.^ Pileus yellow, not striate ; lamellae adnexed. S. 1075 ; 



M. 177; St. 362 B. titubans (Bull.) Fr. 



B.^ Pileus cinereous, striate; lamellae free. S. 11 13; M. 

 176; P. R. 29: 41 B. pulchrifolins (Peck) Mass. 



