Part 1, 1907] POLYPORACEAE 53 
Pileus white or pale-brown, unchanging. 
Tubes entire. 1. M. dealbatus. 
Tubes lacerate. 2. M. unguicularts. 
Pileus ochraceous or sordid, becoming bay or black with age or on drying. 
Pileus ochraceous, becoming bay. 3. M. porphyritis. 
Pileus sordid, becoming black. 4. MW. holotephrus. 
1. Microporellus dealbatus (Berk. & Curt.) Murrill, Bull. Torrey 
Club 32: 483. 1905. 
Polyporus dealbatus Berk. & Curt. Ann. Mag. Nat. Hist. II. 12: 432. 1853. 
Polyporus mutabilis Berk. & Curt. Ann, Mag. Nat. Hist. II. 12: 433. 1853. 
Polyporus petaliformis Berk. & Curt. Jour. Linn. Soc. 10: 307. 1868. 
Polyporus polygrammus Berk. & Curt. Jour: Linn. Soc. 10: 307. 1868. 
Polyporus Ravenelit Berk. & Curt. Grevillea 1: 38. 1872. 
Polystictus cretatus Cooke, Trans. Bot. Soc. Edinb. 13: 137. 1878. 
Polyporus cervicornis Cooke, Grevillea 17: 59. 1889. (Type from St. Lucia.) 
Fomes bomfimensis P. Henn. Hedwigia 43: 175. 1904. (Type from Bom Fim, Amazonas, Brazil.) 
Pileus thin, coriaceous, slightly flexible but easily broken, flabelliform or spatulate, 
conchate, 2-6 < 3-7 & 0.1-0.2 cm.; surface finely tomentose to glabrous, hirtose behind, 
radiate-striate, zonate, dealbate, the zones often light-fulvous; margin very thin, sterile, 
sericeous, undulate to lobed or cleft, inflexed and often splitting when dry: context white, 
very thin, fibrous, fragile; tubes white to isabelline within, scarcely a mm. in length, 
mouths minute, angular, 8-10 to a mm., edges thin, entire, glistening, whitish when 
young, becoming discolored: spores smooth, hyaline: stipe variable, often wanting, 0-7 cm. 
long, 2-7 mm. thick, scutate at the base, expanding into the pileus, laterally attached, 
rarely excentric, usually compressed, with surface and substance resembling that of the 
pileus. 
TYPE LOCALITY: South Carolina. 
Hasitat : Dead wood, especially buried wood. 
DISTRIBUTION: Tropical America, and northward in the United States as far as Delaware and 
Missouri. , 
ExsiccaTi: Rav. Fungi Am. 109; Rav. Fungi Car. 3: 10; Ule, Myc. Bras. 47. 
2. Microporellus unguicularis (Fries) Murrill. 
Polystictus unguicularis Fries, Nov. Symb. 76. 1851. 
Pileus thin, coriaceous, reniform or flabelliform, attached by an attenuate base, 2-3 cm. 
broad, 1-3 mm. thick ; surface uniformly ochroleucous, very smooth, concentrically striate, 
radiate-lineate ; margin acute, incurved when dry: context very thin, less than 1 mm., 
fibrous, somewhat fragile, watery-white; tubes 0.5-1 mm. long, pallid to yellowish, mouths 
irregular, angular, 2-4 to a mm., edges white to pallid, thin, fimbriate-dentate, at length 
lacerate: spores not examined. 
TYPE LOCALITY : Mexico. 
HasitaT: Dead trunks. 
DISTRIBUTION : Known only from the type locality. 
3. Microporellus porphyritis (Berk.) Murrill. 
Polyporus porphyritis Berk. Jour. Bot. & Kew Misc. 8: 196. 1856. 
Pileus thin, coriaceous, flabelliform, 4-5 < 5-6 X 0.1-0.3cm.; surface pelliculose, ochra- 
ceous to light-bay, zonate, glabrous; margin thin, ochraceous, undulate: context fibrous- 
corky, 1-1.5 mm. thick, pallid; tubes short, less than 1 mm., mouths minute, 5-6 to a 
mm., pallid to discolored, very regular, subangular, edges thin, entire, at first obtuse, 
becoming acute: spores not examined: stipe variable, short, slightly lighter than the 
pileus, 5-10 mm. long, 5-8 mm. thick, resembling the pileus in surface and substance. 
TYPE LOCALITY: Panuré, Brazil. 
HapitatT: Dead wood. : ; 
DISTRIBUTION: Cuba; also in Brazil. 
4. Microporellus holotephrus (Berk. & Curt.) Murrill, Bull. Torrey 
Club 32: 484. 1905. 
Polyporus holotephrus Berk. & Curt. Jour. Linn. Soc. 10: 315. 1868. 
Pileus thin, coriaceous, fan-shaped, attenuate behind, laterally attached, 2-5 2-6 
0.1 cm.; surface conspicuously scabrous, tomentose, zonate, radiate-lineate, brown, 
