Polyporus underwoodii Peck 1906

Polyporus underwoodii Murrill ; Peck, Bull. N. Y. State
Mus, 105 : 27. 1906.
Pileus varying from convex to deeply concave, 12-25 cm. in diameter, averaging 0.5 cm. in thickness ; surface obscurely concentrically zonate, milk-white, pruinose, cremeous on drying, the center depressed and avellaneous ; margin irregularly undulate, lobed, either deflexed or recurved, very thin, not ciliate : context white, fleshy, tough, homogeneous, 2-5 mm. thick ; tubes milk-white, 2-3 mm. long, 5 to 6 to a mm., cylindrical, edges thin, entire to lacerate: spores ellipsoidal, hyaline, smooth, 3X6-7/^: stipe short, central, solid, woody, equal or tapering downward, smooth, pruinose, white above, fuliginous below, 3 cm. long, 2-3 cm. thick.
Type locality : Cornwall, Connecticut, on buried decaying roots. Habitat : Dead roots of deciduous trees. Distribution : Connecticut and New York.