MurrRIL_: POLYPORACEAE OF NORTH AMERICA 37 
fus. It is unfortunate that the existence of a Polyporus Curtisti 
renders it necessary to change the species name in the transfer 
from one genus to the other. 
16. Potyporus ARCULARIUS (Batsch) Fr. 
Boletus arcularius Batsch, Elench. Fung. 97. 1783. (Mich. 
Plo Fey S- 1726.) 
Boletus exasperatus Schrad, Spic. 153. 1794. 
Polyporus arcularius Fr. Syst. 1: 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. dentus from Connecticut seems 
nothing more than P. arcularius. There is at Kew 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, Earle ; Pennsylvania, /verhart,;, New Jersey, . 
etrio; Nebraska, Bates; Colorado, Crandall; New Mexico, 
Earle ; Michigan, Longyear ; Kansas, Bartholomew ; Kentucky, 
Price; Mississippi, Ricker; Alabama, Farle, Baker ; Florida, 
Rau, Calkins ; Mexico, C. L. Smith. 
17. Polyporus variiporus sp. nov. 
A small plant resembling P. 7richoloma, but firmer and tougher 
with thicker stipe and more irregular pores. Pileus orbicular, 
convex to depressed, I-2.5 x 0.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 
