36 NORTH AMERICAN FLORA [VoLUME 9 
rather thin, acute, concolorous, undulate: context white, fleshy-tough, somewhat fragile 
when dry, 5-8 mm. thick ; tubes 3-5 mm. long, white to pallid within, slender, mouths 
regular, even, circular, 5-6 to a mm., glistening, white to very pale-avellaneous, edges 
obtuse, entire: spores globose, smooth, hyaline, 54; hyphae 84; cystidia none. 
TYPE LOCALITY: Stony Brook, Massachusetts. 
HABITAT: Dead hemlock trunks, 
DISTRIBUTION: Known only from the type locality. 
21. Tyromyces lacteus (Fries) Murrill. 
Polyporus lacieus Fries, Syst. Myc. 1: 359. 1821. 
Pileus dimidiate, sessile, decurrent, convex, very soft, fleshy, becoming fragile and 
rigid when dry, 24 x 5-8 X0.5-1.5cm.; surface milk-white, sometimes slightly discolored, 
azonate, finely tomentose or pubescent to nearly glabrous, more or less silky-striate ; margin 
abruptly thin, inflexed, undulate, concolorous: context spongy-fibrous, very fragile when 
dry, 5-10 mm. thick, milk-white, unchanging, zonate at times; tubes quite long, slender, 
equaling the thickness of the context, 5-10 mm., milk-white within, mouths regular, 
angular, 4-5 to a mm., glistening, becoming lacerate and somewhat uneven, edges thin, 
dentate to sharply toothed, fragile, white to slightly yellowish: spores allantoid, smooth, 
hyaline, 4-5 & 1-1.5 z. 
TYPE LOCALITY: Sweden. 
HaBitTaT: Dead deciduous and coniferous wood. 
DISTRIBUTION : Eastern Canada to Virginia and west to Kansas ; also in Europe. 
ILLUSTRATION : Fries, Ic. Hymen. p/. 182, f. 1. 
22. Tyromyces leucomallus (Berk. & Curt.) Murrill. 
Polyporus leucomallus Berk. & Curt. Jour. Linn. Soc. 10: 308. 1868. 
Polyporus verecundus Berk. & Curt. Jour. Linn. Soc. 10: 309. 1868. (Type from Cuba.) 
Trametes pura Berk. & Curt. Jour. Linn. Soc. 10: 320. 1868. (Type from Cuba.) 
Pileus soft, fleshy, very fragile when dry, dimidiate, sessile, convex, 3-5 X5-8 
< 0.5-1.5 cm.; surface white to slightly cinereous, azonate, anoderm, tomentose, appressed- 
fibrose when young; margin acute to slightly obtuse, sometimes inflexed, brown or black 
when bruised : context very soft and friable when dry, milk-white, 0.5-1 cm. thick; tubes 
white, 3-10 mm. long, mouths minute, 6-7 to a mm., subcircular, edges white to pallid, 
subglistening, very thin and dentate to slightly lacerate : spores smooth, hyaline. 
TYPE LOCALITY: Cuba. 
HasitaT: Dead wood. 
DISTRIBUTION: Cuba. 
23. Tyromyces albogilvus (Berk. & Curt.) Murrill. 
Polyporus albogilvus Berk. & Curt. Jour. Linn. Soc. 10: 308. 1868. 
Pileus dimidiate to flabelliform, sometimes attached by a very narrow base, fleshy, rigid 
when dry, convex above, plane below, 2.5 & 2.5-3 & 0.4-0.7 cm. ; surface finely tomentose 
to resinous-glabrous, gilvous when fresh, azonate, somewhat radiate-rugose; margin rather 
thick, often obtuse, entire, concolorous: context thin, white, fleshy to fragile, 1 mm. thick; 
tubes long, slender, 4-6 mm., white or pale-yellowish, mouths minute, angular, 6 to amm., 
glistening, white or pale-yellowish, usually abruptly radially elongate near the margin, 
presenting the appearance of lamellae, edges thin, entire or slightly dentate: spores 
smooth, hyaline. 
TYPE LOCALITY : Cuba. 
Hasirat: Dead trunks in woods. 
DISTRIBUTION: Known only from the type locality. 
24. Tyromyces fulvitinctus (Berk. & Curt.) Murrill. 
Polyporus fulvitinctus Berk. & Curt. Jour. Linn. Soc. 10 ‘S313. 1868. 
Hapalopilus fulvitinctus Murrill, Bull. Torrey Club 31: 419. 1904. 
Pileus fleshy-tongh, rigid and fragile when dry, sessile, dimidiate, applanate, decur- 
rent, 3-4 cm. broad, 3-5 mm. thick; surface tomentose, alutaceous-fulvous, becoming 
glabrous behind, azonate, subsulcate, margin rather thick, fertile, entire or undulate : con- 
