Par’ 1, 1907] POLYPORACEAE 37 
text homogeneous, corky-fragile, whitish to isabelline, 1-2 mm. thick; tubes short, 2-3 
mm. long, white to isabelline or avellaneous, mouths small, circular to angular, pale- 
umbrinous in dried specimens, edges thin, obtuse, entire: spores subglobose to ovoid, 
smooth, hyaline, 34; hyphae hyaline; cystidia none. 
TYPE LOCALITY: Cuba. 
HABITAT: Dead wood. 
DISTRIBUTION : Cuba. 
25. Tyromyces duracinus (Pat.) Murrill. 
Leptoporus duracinus Pat. Bull. Soc. Myc. Fr. 18: 174. 1902. 
Pileus convex, rigid, hard, 1.5-2.5 cm. broad, 2-4 mm. thick; surface isabelline to 
pale-fulvous, darker near the margin, glabrous, marked with 1-2 concentric furrows; 
margin inflexed, usually acute: context hard, fragile, white, 1-2 mm. thick; tubes 1 mm. 
long, white to discolored, mouths small, circular, 5 to a mm., edges white to avellaneous, 
obtuse, entire: spores cylindrical, smooth, hyaline, 4X14. 
TYPE LOCALITY: Guadeloupe. 
HasitaT: Dead branches of Cecropia peltata. 
DISTRIBUTION : Known only from the type locality. 
DOUBTFUL SPECIES 
Polyporus impolitus Fries, Nov. Symb. 58. 1851. Described from specimens col- 
lected by Oersted on trunks of trees in Costa Rica. These specimens were first preserved 
in alcohol and afterwards dried. They have not been seen by me. 
Polyporus trichrous Berk. & Curt. Ann. Mag. Nat. Hist. 12: 434. 1853. Collected in 
South Carolina by Ravenel. Type not found. Species doubtfully assigned to Tyromyces 
chiefly on account of its cheesy consistency. 
Leptoporus mexicanus Pat. Bull. Soc. Myc. Fr. 14: 55. 1898. Collected by Maury in 
Mexico on trunks of coniferous trees. Type not seen. 
Leptoporus nauseosus Pat.; Duss, Enum. Champ. Guad. 27. 1903. Collected by Duss 
in Guadeloupe. 
28. SPONGIPELLIS Pat. Hymén. Eur. 140. 1887. 
Postia Karst. Rev. Myc. 39: 17. 1881. Not Postia Boiss. & Blanch. 1875. 
Hymenophore annual, epixylous, sessile, dimidiate, simple or imbricate, rather large; 
surface white, anoderm, sodden and bibulous: context white, duplex, spongy above, firm 
below; hymenium concolorous, tubes thin-walled: spores smooth, pee 
Type species, Spongipellis spumeus (Sow.) Pat. 
Pileus more than 1 cm. thick, usually large. 
Tubes white or slightly discolored. 
Margin of pileus thick and rounded. 
Tubes large, 1 mm. or more across. 
Tubes much smaller. 
Margin of pileus thin, not rounded. 
Surface conspicuously hairy. 
Surface nearly glabrous. 
Tubes becoming very dark-colored. 
Tubes minute, resinous. 
Tubes large, 1-2toa mm., not resinous. 
Pileus less than 1 cm. thick, small or medium. 
Pileus 5 cm. or less broad: 
Pileus 6 cm. or more broad. 
Surface finely tomentose. 
Surface conspicuously hairy. 
S. unicolor. 
S. occidentalis. 
S. borealis, 
S. delectans, 
S. fissilts. 
S. luridescens. 
S. hydrophilus. 
S. galactinus. 
S. substuppeus. 
oO NM Aw Be Ne 
1. Spongipellis unicolor (Schw.) Murrill. 
Boletus unicolor Schw. Schr. Nat. Ges. Leipzig 1: 97. 1822. 
Sistotrema spongiosum Schw. Schr. Nat. Ges. Leipzig 1: 101. 1822. (Type from North Carolina.) 
Polyporus labyrinthicus Fries, Elench, Fung. 83. 1828. 
Polyporus unicolor Fries, Epier. Myc. 458. 1838. 
Polyporus obtusus Berk. ‘Ann. Mag. Nat. Hist. 3: 390. 1839. (Type from North America.) 
Polyporus Schulzeri Fries, Hymen. Eur. ed. 2. 556. 1874. (Type from Hungary.) 
Polyporus tomentoso-quercinus A. &. Johnson, Bull. Minn. Acad. Nat. Sci. tT: 338, 1878. (Type 
from Minnesota.) 
Trametes unicolor Murrill, Bull. Torrey Club 32: 638. 1906. 
