Polyporus guianensis Mont. 1840

Polyporus wrightii Murrill, sp nov
Pileus circular, convex-plane, umbilicate, 3^X0.1 cm.; surface delicately radiatestriate, glabrous, isabelline when dry ; margin thin, acute, bay, irregularly undulate or /lobed, slightly incurved, not ciliate : context membranous, pallid, corky, homogeneous, less than 0.5 mm. thick; tubes decurrent, umbrinous when dry, 0.5-1 mm. long, 2-3 to a mm., mouths irregular, angular, very variable in size, edges thin, entire, slightly toothed with age : spores smooth, hyaline : stipe short, central, solid, woody, equal or slightly enlarged at the base, pulverulent, black, 5-7 mm. long, 2-3 mm. thick.
Type collected on dead wood in Cuba, Charles Wright 201. Distribution : Known only from the type locality.

Polyporus aemulans Berk. & Curt. Jour. Linn. Soc. 10 : 304. 1868
Pileus thin, circular, umbilicate, 3.5-4 X 0.05-0.1 cm. ; surface radiate-striate, ochraceous, dark yellowish-brown when dry, glabrous at maturity ; margin thin, straight, subcinereous, finely hispid, irregularlj' incised or lobed, sterile for 1-2 mm. : context tough, membranous, pallid to pale-brown ; tubes decurrent, yellowish, less than 1 mm. long, gradually disappearing near the margin, mouths alveolar, shallow, 2 to a mm., usually radially elongate, edges acute, becoming somewhat elongate : spores not examined : stipe central,
equal, coffee-colored, pulverulent, expanding into the pileus, 2 cm. long, 3-4 mm. thick.
Type locality ; Cuba. Habitat : Dead wood. Distribution : Known only from the type locality.

Polyporus melanopus is a species of mushroom in the genus Polyporus. It can be found growing on dead wood, or from a submerged sclerotium, from spring through fall.