16 NORTH AMERICAN FLORA [VoLuME 9 
Pileus extensively effused, shortly reflexed, imbricate, sessile, dimidiate, laterally con- 
nate, 0-1.5 x 14 0.1-0.2 cm.; surface white, subzonate, concentrically furrowed in 
large specimens, villose ; margin very thin, deflexed, undulate to lobed: context white, 
membranous, less than 1 mm. thick; tubes short, irregular, white to isabelline, 1-3 mm. 
long, mouths angular, about 2 to a mm., edges uneven, soon splitting into teeth, which are 
compressed, pointed, fimbriate, dentate to incised: spores cylindrical, slightly curved, 
smooth, hyaline, 6-7 < 2-3 #; hyphae septate, 2-3 4; basidia 16-20 n. 
TYPE LOCALITY: Sweden. 
Hasitat: Dead deciduous wood. ; 
DISTRIBUTION : North America; also in Europe and Asia. _ . 
ExsiccaTi: Ellis, N. Am. Fungi 107,319; Thiim. Myc. Univ. 205, 1208; Shear, N. Y. Fungi 
46; Rav. Fungi Car. 1: 26; Ellis & Ev. N. Am. Fungi 20/6, 2310; Ellis & Ev. Fungi Columb. 
J; Romell, Fungi Scand. 20; Barth. Fungi Columb. 2327. 
DOUBTFUL SPECIES 
Irpex pityreus Berk. & Curt. Grevillea 1: 102. 1872. Described from specimens col- 
lected by Bennett in Rhode Island. The types at Kew are small and discolored, leaving 
their identity in doubt. 
22. PORONIDULUS Murrill, Bull. Torrey Club 31: 425. 1904. 
Hymenophore annual, tough, sessile, epixylous, at first sterile and cup-like, the fertile 
portion developing from the sterile: context white, fibrous; tubes short, thin-walled, mouths 
polygonal: spores ellipsoidal, smooth, hyaline. 
Type species, Boletus conchifer Schw. 
1. Poronidulus conchifer (Schw.) Murrill, Bull. Torrey 
Club 31: 426. 1904. 
Boletus conchifer Schw. Schr. Nat. Ges. Leipzig 1: 98. 1822. 
Boletus virgineus Schw. Schr, Nat. Ges. Leipzig 1: 98. 1822. (Type from North Carolina.) 
Pileus thin, coriaceous, dimidiate to flabelliform, usually narrowly attached, conchate, 
springing from a sterile, cup-like structure, which usually appears on the mature sporo- 
phore, near the base, 1.5-2 « 2-4  0.1-0.2 cm.; surface white to isabelline, with pale- 
latericeous zones, finely tomentose to glabrous, the sterile portion avellaneous, with narrow, 
black, concentric lines; margin thin, concolorous, undulate: context very thin, membran- 
ous, white, less than 1 mm. in thickness; tubes short, about 1 mm. long, thin-walled, 
white, mouths angular, irregular, 3 to a mm., edges thin, uneven, dentate: spores ellip- 
soidal, smooth, hyaline. 7 
TYPE LOCALITY: North Carolina, 
Hapitat: Fallen branches and dead limbs of elm. 
DISTRIBUTION : Eastern Canada to Alabama and west to Kansas. 
Exsiccati: Rav. Fungi Am. 704; Rav. Fungi Car. 3: 27; Ellis, N. Am. Fungi 1303, Rab.- 
Wint. Fungi Eur. 3429. 
23. CORIOLUS Quél. Ench. Fung. 175. 1886. 
Hansenia Karst. Medd. Soc. Faun. Fl. Fenn. 5: 39. 1879. Not Hansenia Turcz. 1844. 
Cyclomycetella Murrill; Bull. Torrey Club 31: 422. 1904, 
Hymenophore annual, epixylous, sessile, zonate, anoderm, hairy or glabrous: context 
thin, white, flexible, fibrous, leathery; tubes thin-walled, white, at length splitting into 
irpiciform teeth in several species, mouths polygonal or irregular: spores smooth, hyaline. 
Type species, Polyporus zonatus Fries. 
Tubes more or less entire, at least until the sporophore is quite old. 
Surface of pileus wholly or partly glabrous when mature or clothed 
only with inconspicuous hairs. 
Pileus not entirely glabrous at maturity. 
Pileus marked at maturity with glabrous zones of a different 
color from the rest of the surface. 
Glabrous zones large, numerous, conspicuously and variously 
colored. ' 1. C. versicolor. 
Glabrous zones small and comparatively inconspicuous. 
Surface villose between the zones, which are late in appear- 
ing; plants small, 1-2 cm. in diameter, 2. C. hirsutulus. 
