Parr 1, 1907] POLYPORACEAE 15 
1. Melanoporia nigra (Berk.) Murrill. 
Polyporus niger Berk. Lond. Jour. Bot. 4: 304. 1845. 
Broadly effused, inseparable, rigid, heavy, 0.5-2.5 cm. thick; margin sterile, nearly 
smooth, slightly elevated at times, adnate, irregular, black : context thin, fuliginous, firm, 
with a horny black layer next to the substratum; hymenium distinctly stratified, uneven, 
black ; tubes 2-4 mm. long each season, fuliginous within, mouths small, regular, thin- 
walled, 4toa mm., edges entire: spores smooth, ovoid, thick-walled, black, 74.54; 
hyphae black or dark-brown ; cystidia none. 
TYPE LOCALITY : Ohio. te 
HaBiItTaT: Dead oak trunks or stumps. 
DISTRIBUTION: South Carolina, Ohio, Missouri, and Wisconsin. 
Exsiccatr: Rav. Fungi Car. 1: 20. 
21. IRPICIPORUS Murrill, Bull. Torey Club 32: 471. 1905. 
Hymenophore annual, epixylous, sessile, effused-reflexed, white or pallid throughout ; 
surface anoderm, glabrous or velvety, not distinctly zonate, margin acute: context white, 
coriaceous or corky ; hymenium hydnoid or irpiciform, with traces of shallow obsolete tubes 
near the margin: spores smooth, hyaline. 
Type species, /rpex mollis Berk. & Curt. 
Margin of pileus cirrhose ; pileus glabrous, 2 mm. thick. 1. L. cubensis. 
Margin of pileus not cirrhose. 
Teeth 1 cm. or more long; pileus usually large and thick. 2. I. mollis, 
Teeth less than 0.5 cm. long; pileus thin and shortly reflexed. 3. I. lacteus. 
1. Irpiciporus cubensis (Berk. & Curt.) Murrill. 
Irpex cubensis Berk. & Curt. Jour. Linn. Soc. 10: 326. 1868. 
Pileus reniform, sessile, 0.5-0.7 X 1.5 X 0.2 cm.; surface glabrous, radiate-lineate, white 
to isabelline, azonate, smooth ; margin deflexed, cirrhose, concolorous: context white, fragile, 
less than 1 mm. thick ; tubes 1-1.5mm. long, white to discolored, 3-4 to a mm., very soon 
splitting into teeth, which are compressed, pointed and dentate: spores! not examined. 
TYPE LOCALITY: Cuba. 
HasiratT: Dead wood. 
. DISTRIBUTION : Known only from the type locality. 
2. Irpiciporus mollis (Berk. & Curt.) Murrill, Bull. Torrey 
Club 32: 471. 1905. 
Irbex mollis Berk. & Curt. Jour. Bot. & Kew Misc. 1: 236. 1849. 
Irpex crassus Berk. & Curt. Jour. Bot. & Kew Misc. 1: 236. 1849. (Type from North Carolina, 
on a decaying oak.) 
Pileus sessile, dimidiate, imbricate, decurrent, 34 481-3 cm.; surface white, 
finely pubescent, azonate, sulcate at times, often aculeate behind with age: context white, 
coriaceous, 1-5 mm. thick; tubes soon splitting into teeth, which are 1-2 cm. long, com- 
pressed to subulate, slender, more or less pointed, dentate or incised, puberulent to gia- 
brous, white to pale flesh-colored, about 1 mm. apart at the base: spores globose, smooth, 
hyaline, 5-7 #; hyphae 6 4; cystidia none. 
TYPE LOCALITY: Santee river, South Carolina. 
HABITAT: Dead deciduous wood. 
DISTRIBUTION : Temperate North America. 
ExsiIccati : Ellis & Ev. N. Am. Fungi320,; Ellis, Ev. & Barth. Fungi Columb. 1735. 
3. Irpiciporus lacteus (Fries) Murrill. 
Sistotrema lacteum Fries, Obs. Myc. 2: 266. pl. 6, f. 1. 1818. 
Boletus Tulipiferae Schw. Schr. Nat. Ges. Leipzig 1: 99. 1822. (Type from North Carolina.) 
Irpex sinuosus Fries, Elench. Fung. 1: 145. 1828. (Type from Sweden, on fallen oak branches.) 
Trpex Aiea Fries, Epicr. Myc. 522. 1838. Clyne from North America, on trunks of Livio- 
dendron.) 
Irpex Tulipiferae Fries, Epicr. Myc. 523. 1838. 
Irpiciporus Tulipiferae ‘Murrill, Bull. Torrey Club 32: 472. 1905. 
1 The spore-characters of many of the species treated in the following pages have been 
obtained for me by Mr. Guy West Wilson. It has been impossible to examine the spores in 
many of the older type specimens, and in some specimens spores could not be found. 
