60 NORTH AMERICAN FLORA LVOLUME 9 
22. Polyporus variiporus Murrill, Bull. Torrey Club 31: 37. 1904. 
A small plant resembling P. Zricholoma, but firmer and tougher, with thicker stipe 
and more irregular pores. Pileus orbicular, convex to depressed, 1-2.5 <0.1-0.2 cm.; sur- 
face glabrous, more or less radiately striate, somewhat concentrically rugose, straw-colored 
to isabelline, fulvous to chestnut-colored around the margin, which is thin, inflexed, undu- 
late, finely ciliate, the cilia being fugacious: context 1-1.5 mm. thick, tough, white ; 
tubes 0.5 mm. in length, 2-4 mm. in diameter, very irregular, much elongate radjally 
near the stipe or in the marginal folds, not noticeably decurrent, yellowish, polygonal to 
lamelloid, edges firm, entire, becoming denticulate or fimbriate with age: spores ellipsoid, 
smooth, hyaline, 47: stipe central, hollow, increasing above, lighter than the pileus, 
subglabrous, with silky luster, 2 cm. long, 2-6 mm. thick, the buried base enlarged, 
tomentose, and frequently black. 
TYPE LOCALITY: Porto Rico. 
Hapsitat: Sticks buried in sandy soil in woods. 
DISTRIBUTION : Known only from the type locality. 
23. Polyporus Tricholoma Mont. Ann. Sci. Nat. II. 8: 365. 1837. 
? Polyporus gracilis Klotzsch, Ann. Nat. Hist. 3: 384. 1839. (Type from the West Indies.) 
Polyporus siipitarius Berk. & Curt. Jour. Linn. Soc. 10: 304. 1868. (Type from Cuba.) 
Polyporus Humphreyi P. Henn. Hedwigia 37: 280. 1898. (Type from Jamaica.) 
Plants white, slender, clustered, resembling a small agaric. Pileus circular, convex to 
infundibuliform, 1.5-4< 0.05-0.2 cm.; surface white or pallid to ochraceous or reddish- 
brown, azonate, fibrillose to glabrous; margin straight or inflexed, conspicuously orna- 
mented with rigid hairs, or cilia, 2 mm. long and of uncertain duration: context pallid, 
membranous, tough; tubes slightly decurrent, white to pallid, 0.5-1 mm. long, mouths 
angular, 5 to a mm., edges thin, dentate, elongate: spores ellipsoidal, smooth, hyaline, 
2-2.5 X 6-7: stipe central, equal, glabrous, concolorous, very slender, 1.5-2.5 cm. long, 
1-1.5 mm. thick. 
TYPE LOCALITY: Cuba. 
HasitaT: Dead sticks, logs and other decaying timber in woods. 
DISTRIBUTION : Tropical America. 
ILLUSTRATION: Mont. Pl. Cell. Cuba p/. 17, f. 1. 
24. Polyporus Cowellii Murrill, Bull. Torrey Club 31: 39. 1904. 
Asmall light-colored plant resembling an agaric, having a very thin translucent context, 
minute pores and a slender central stipe. Pileus orbicular, convex to plane, umbilicate, 
1-2 X 0.02-0.05 cm. ; surface nearly glabrous, minutely concentrically rugose, straw-colored 
to isabelline, becoming darker and hygrophanous around the margin or in blotches or even 
over the entire surface, often faintly radiate-striate about the center with delicate white or 
brown lines ; margin very thin, straight or inflexed, somewhat irregular in outline, finely 
denticulate, the teeth prolonged into short fugacious cilia: context extremely thin, mem- 
branous, 0.1-0.2 mm. thick, white or pallid, partially or entirely translucent; tubes 0.2-0.4 
mim. long, 3-6 toa mm., larger by confluence, adnate, pallid, polygonal, edges very thin, 
subentire, becoming fimbriate with age: spores ellipsoidal, smooth, hyaline, binucleate, 
2.55: stipe central, solid, very slender, equal, concolorous or slightly darker, pruinose 
to glabrous, smooth, longitudinally striate, 2-3 cm. long, 0.3-1 mm. thick, soft and milk- 
white at the center. 
TYPE LOCALITY: St. Kitts. 
HaBItTaT: Decaying wood. 
DISTRIBUTION : Porto Rico and St. Kitts, 
25. Polyporus caudicinus (Scop.) Murrill, Jour. Myc. 9: 89. 1903, 
Boletus caudicinus Scop. Fl. Carn. ed. 2. 2: 469. 1772. 
Boletus squamosus Huds. Fl. Angl. ed. 2. 614. 1778. 
Polyporus Ulmi Paulet, Traité Champ. f/. 727. 1812? 
Sporophore of immense size, reaching 50 cm. in breadth and 3 cm. in thickness, usually 
found in imbricated masses projecting from the trunks of living trees. Pileus subcircular 
