MUKRII.I.: Por.YPORACEAE OF NORTH AMERICA 37 



/us. It is unfortunate that the existence of a Po/yponis Ciirtisii 

 renders it necessary to change the species name in the transfer 

 from one genus to the other. 



1 6. PoLYPORUS ARCULARius (Batsch) Fr. 

 Boletus arcularius Batsch, Elench. Fung. 97. 1783. (Mich. 



//. 70. f- 5- 1729-) 



Boletus exaspcratus Schrdid. S^'\c. 153. 1794. 



Poly poms arciitarins Fr. Syst. I : 342. 1821. 



This species was described by Batsch as follows : " Stipitatus ; 

 stipite subgracili, subclavato ; pileo membranaceo convexo, sub- 

 ulato-fimbriato ; stipiteque concoloribus, spadiceo-rufis ; cellulis 

 latissimis, rhombeis, aequalibus albis." Fries placed it in the 

 genus Favolus, which he treated as a subgenus under Polyporus. 

 Its tubes are certainly favoloid, but its close relationship to P. 

 Polyporus has kept it near this species rather than with species of 

 Favolus. Wright's specimen of P. lentus from Connecticut seems 

 nothing more than P. arcularius. There is at Kevv also the 

 remains of a specimen from Ohio, which very probably belonged 

 in the same category. 



P. arcularius shows little variation except in size throughout 

 its wide range. It occurs on decaying wood and shows much the 

 same habit as P. elegans and P. Polyporus, but differs from these 

 species in occurring more abundantly in the south. Specimens 

 have been examined from the following localities : Tyrol, Bresa- 

 dola ; Connecticut, £^rt;;'/£' ; Pennsylvania, 75?r/'//rt;7/ New Jersey, 

 Ellis; G^ovgxdi, Raven el ; 0\\\o, James, Morgan ; Missouri, Z^^'w- 

 ctrio ; Nebraska, Bates; Colorado, Craiulall ; New Mexico, 

 Earle ; Michigan, Longyear ; Kansas, Bartholoinetv ; Kentucky, 

 Price; Mississippi, Richer ; Alabama, Earle, Baker; Florida, 

 Rau, Calkins ; Mexico, C. L. Smith. 



1 7. Polyporus variiporus sp. nov. 



A small plant resembling P. Tricholoma, but firmer and tougher 

 with thicker stipe and more irregular pores. Pileus orbicular, 

 convex to depressed, 1—2.5 X O. i— 0.2 cm., surface glabrous, more 

 or less radiately striate, somewhat concentrically rugose, straw- 

 colored to isabelline, fulvous to chestnut-colored around the mar- 

 gin, which is thin, inflexed, undulate, finely ciliate, the cilia being 



