Parr 1, 1907] POLYPORACEAE 55 
Margin of pileus strigose, fertile below. 
Pileus very thin, smooth, pellucid, fragile ; stipe thicker below, 
setulose. 19. P. arcularielius. 
Pileus very thin, concentrically rugose, opaque, less than 1 cm. 
in diameter ; stipe beset with sharp bristles. 20. P. arculariformis. 
Pileus not very thin, fuscous-squamulose to glabrous; stipe 
equal, grooved, squamulose, grayish-fuscous. 21. P. arcularius. 
Tubes not aveolar. 
Tubes very irregular; stipe usually thick and polished; pileus 
tough, umbilicate, yellowish-white with brown marginal band, 
cilia short, fugacious. 22. P. vartiporus. 
Tubes fairly regular; stipe slender, not polished; plants rather 
delicate, cilia variable in form and persistence. 
Pileus opaque, not translucent, 1-4 cm. in diameter, cilia long, 
of uncertain duration ‘ plants mostly cespitose. 23. P. Tricholoma. 
Pileus very thin, more or less translucent, 1-2 cm. in diameter, 
cilia short, slender, fugacious; plants not cespitose. 24. P. Cowellit. 
Stipe wholly or partly black or fuliginous, variously attached, usually 
darker than the pileus. 
Pileus squamose, very large, flabelliform ; tubes large, alveolar. 25. P. caudicinus. 
Pileus finely tomentose, drab-colored, with reddish-brown spots, small, 
circular; tubes rounded, minute. 26. PP. maculosus. 
Pileus not as above. 
Tubes reaching 0.5-1 mm. or more in diameter. 
Stipe short, less than 1 cm. long; ‘ileus normal. 27. P. Wrightii. 
Stipe usually very long, 1-15 cm.; pileus sometimes aborted, re- 
sembling a Xylaria. .- 28. P. marasmioides. 
.Tubes much smaller, 4-10 to a mm. 
Pileus 12-25 cm. in diameter, white or pallid. 29. P. Underwoodit. 
Pileus rarely half this size and never white. 
Surface light-colored, isabelline to pale-umbrinous. 
Stipe central; or excentric; species confined to temperate 
regions. 30. P. elegans. 
Stipe lateral ; species confined to tropical regions. 31. P. subelegans. 
Surface dark-colored, bright-bay to almost black. 
Stipe central ; pileus proliferous at times, surface glabrous; 
species confined to tropical and South America, 32. P. diabolicus. 
Stipe horizontal, usually lateral or excentric, rarely centralin 
temperate species. 
Stipe 2-6 cm. long; pileus 5-20 cm. in diameter; species 
abundant in temperate regions. 33. P. fissus, 
Stipe 0.3-1 cm. long; pileus 2-10 cm. in diameter ; species 
confined to the tropics. 
Surface glabrous. 34. P. Blanchetianus. 
Surface marked with rows of serrated black squamules. 35. P. scabellus. 
1. Polyporus hydniceps Berk. & Curt. Jour. Linn. Soc. 10: 305. 1868. 
Pileus cup-shaped or irregularly broken up into flabelliform lobes, 3-4 0.1-0.2 cm. ; 
surface light-brown to bay, adorned with very prominent cylindrical or subpyramidal proc- 
esses; margin thin, irregular, undulate or lobed, inflexed: context pallid, fleshy, rigid 
and fragilé when dry, about 1 mm. thick; tubes decurrent, pallid to ochraceous, short, 
mouths subelliptical or circular, becoming angular, 4-6 toa mm., edges entire to dentate: 
spores smooth, hyaline: stipe central or excentric, short, thick, usually reticulate, brown 
to blackish, fleshy, 2 cm. long, 5-15 mm. thick. 
TYPE LOCALITY: Cuba. 
HapitaT: Dead wood. 
DISTRIBUTION: Cuba. 
2. Polyporus fagicola Murrill, Torreya 6: 35. 1906. 
Pileus circular, convex to plane, umbilicate, 4-5 x 0.1-0.3 cm.; surface smooth, pale- 
avellaneous, ornamented with tufts of innate fibrils, which are larger and darker near the 
center and somewhat radially and imbricately arranged; margin very sharp, slightly 
decurved, regular in outline, not ciliate: context thin, fibrous, white; tubes milk-white, 
decurrent, favoloid, 1-2 toa mm., edges very thin, fimbriatulate: spores ellipsoid, smooth, 
hyaline, 3-4 6-7: stipe central, solid, thick, nearly equal, concolorous, conspicuously 
hispid, especially near the base, 2 cm. long, 1 cm. thick. 
TYPE LOCALITY: Boarstone Mountain, Piscataquis County, Maine. 
HagitTar: Fallen decorticated beech trunk. . 
DISTRIBUTION: Known only from the type locality. 
