Spongipellis unicolor (Fr.) Murrill 1907

Spongipellis unicolor (Schw,) Murrill
Boletus unicolor Schw. Schr. Nat. Ges. I^eipzig 1 : 97. 1822.
Sistotrema spongiosum Schw. Schr. Nat. Ges. Leipzig 1 : 101. 1822. (Type from North Carolina.)
Polyporus labyrinthicus Fries, Klench. Fung. 83. 1828.
Polyporus unicolor V ties,, Kpicr. Myc. 458. 1838.
Polyporus obtusus Berk. Ann. Mag. Nat. Hist. 3 : 390. 1839. (Type from North America.)
Polyporus Schulzeri Fries, Hymen. Hur. ed. 2. 556. 1874. (Type from Hungary.)
Polyporus iomentoso-quercinus A. K. Johnson, Bull. Mitin. Acad. Nat. Sci. 1 : 338. 1878. (Type
from Minnesota.) Trameies unicolor Murrill, Bull. Torrey Club 32 : 638. 1906. Pileus somewhat imbricate, large and spongy, at length indurate, dimidiate, sessile, often ungulate, 5-7 X 10-15 X 3-5 cm. ; surface spongy-tomentose, hirtose, azonate, smooth, sordid-white to isabelline or fulvous; margin very thick and rounded, sterile, entire, concolorous : context spongy-fibrous, white, indurate with age, especially below, 1~2 cm. thick ; tubes very long, 2-3 cm., white to isabelline within, mouths large, irregular, often sinuous, 1-2 mm. broad, edges thin, fimbriatedentate to slightly lacerate, white to isabelline, at length bay and resinous in appearance: spores globose, smooth, hyaline, 6-8/^; hyphae hyaline, 6//; cystidia none.
Type locality : North Carolina.
Habitat : Diseased living trunks of various species of oak ; also found on living maples. Distribution : New Jersey to Alabama and west to Mississippi and Minnesota ; also in Europe.