46 NORTH AMERICAN FLORA [VoLUME 9 
minute, 7 toa mm., subcircular, edges white to yellowish-discolored, thin, dentate: spores 
not examined. 
TYPE LOCALITY: Cuba. 
HapitaT: Dead trees, 
DISTRIBUTION: Known only from the type locality. 
3. Rigidoporus substereinus Murrill, sp. nov. 
Pileus thin, coriaceous, rigid and inflexed when dry, dimidiate, attached by a narrow 
base, applanate, 1-3 1.5-5 <0.1-0.2 cm. ; surface smooth, shining, glabrous, conspicu- 
ously zonate, radiate-rugose, latericeous to bay, with isabelline lines, much resembling a 
Stereum ; margin very thin, smooth, cremeous, broadly sterile below, sharply inflexed on 
drying : context exceedingly thin, white, fibrous; tubes minute, 0.5-1.5 mm. long, white 
to pallid within, mouths very even, regular, angular, inconspicuous, 6-7 toa mm., edges 
thin, entire, whitish-pruinose to ochraceous or pale flesh-colored : spores smooth, hyaline. 
Type collected at the base of El Yunque, Cuba, on dead sticks in woods, March, 1903, L. M. 
Underwood & FS. Earle 1211, 
DISTRIBUTION : Cuba ; British Honduras. 
4. Rigidoporus Liebmanni (Fries) Murrill. 
Polyporus Liebmannt Fries, Nov. Symb. 59. 1851. 
Polyporus stereinus Berk. & Curt. Jour. Linn. Soc. 10: 308. 1868. (Type from Cuba.) 
Pileus fleshy to woody, hard and horny when dry, thin, flabelliform or obovate, sessile, 
convex, 1.5-2 243 X 0.2-0.4 em.; surface multizonate, glabrous, bay or blackish, often 
rugose behind; margin thin, entire, pallid, sterile, inflexed when dry: context very thin, 
white, fibrous, brown and very fragile in type specimens; tubes slender, 1-1.5 mm. long, 
white to pallid within, mouths whitish-pruinose to yellowish-brown, subcircular, incon- 
spicuous, even, regular, 10 to a mm., edges thin, entire: spores ovoid, smooth, hyaline. 
TYPE LOCALITY: Mirador, Mexico. 
HapBitat: Dead wood. . 
DISTRIBUTION: Mexico, Cuba, and Porto Rico. 
5. Rigidoporus contrarius (Cooke) Murrill. 
Fomes contrarius Cooke, Grevillea 15: 21. 1886. 
Pileus attached by the vertex, subcircular to dimidiate, applanate, fleshy-corky, rigid 
when dry, 3-6 5-11 X0.3-0.5 cm.; surface ochraceous, soon becoming brown, zonate, 
tomentose, at length glabrous, slightly concentrically sulcate; margin thin, entire or undu- 
late, sterile, ochraceous, easily bruised: context thin, fibrous-corky, pallid, 1-3 mm. thick ; 
tubes pallid, 2-4 mm. long, mouths circular, regular, white to discolored, 5 to a mm., 
edges very obtuse, entire, glistening: spores smooth, hyaline. 
TYPE LOCALITY : Cuba. 
Haszirat: Dead trunks. 
DISTRIBUTION: Cuba. 
6. Rigidoporus surinamensis (Miq.) Murrill, Bull. Torrey 
Club 34: 473. 1907. 
? Polyporus detonsus Fries, Linnaea 5: 519. 1830. (Type from Brazil.) 
Polyporus surinamensis Mig. Bull, Sci. Phys, Nat. Néerl. 1839: 454, 1839. 
? Polyporus inconspicuus Miq. Bull. Sci. Phys. Nat. Néerl. 1839: 454. 1839. (Type from Guiana.) 
Polyporus micromegas Mont. Pl. Cell. Cuba 423. 1842, (Type from Cuba.) 
Polyporus zonalis Berk. Ann. Mag. Nat. Hist. 10: Suppl. 375. 1843. (Type from Ceylon.) 
Polyporus plumbeus Lév. Ann. Sci. Nat. III. 5: 136. 1846. (Type from Guadeloupe.) 
Polystictus rufopictus Cooke, Grevillea 15: 23. 1886. (Type from Cuba.) . 
Rigidoporus micromegas Murrill, Bull. Torrey Club 32: 478. 1905. 
Pileus imbricate-multiplex, laterally connate, sessile, dimidiate or reniform, fleshy- 
corky, rigid when dry, convex or applanate, 2-3 X 2.5-5 X 0.3-0.6 cm.; surface multizo- 
nate, smooth or rugulose, pruinose to glabrous, isabelline to latericeous ; margin acute, thin, 
inflexed, entire or undulate, often obtuse with age: context very thin, white, fibrous, 1-2 
mm. thick; tubes white, 2-4 mm. long, slender, mouths minute, circular to angular, regu- 
