32 NORTH AMERICAN FLORA [VoLUME 9 
3. Tyromyces Palmarum Murrill, sp. nov. 
Pileus very broad, thin, applanate, sessile, dimidiate, concave below, incurved on dry- 
ing, fleshy-tough to rigid, 6-10 x 10-20 & 0.5-0.8 cm.; surface glabrous, nearly smooth, 
slightly rugose or tubercular, white to cremeous; margin thin, undulate to lobed, fertile, 
concolorous: context white, fleshy-fibrous to rigid and somewhat fragile on drying, 3-5 
mm. thick; tubes 24 mm. long, white to yellowish within, mouths glistening, angular, 
regular, 3 to a mm., white to slightly yellowish and finally avellaneous, edges thin, entire: 
spores globose, smooth, hyaline, 3u; hyphae 5; cystidia none. 
Type collected at the base of E] Yunque, Cuba, on a royal palm log, March, 1903, Z. M7. Un- 
derwood & FS. Earle 1142. ‘ 
DISTRIBUTION: Cuba and Jamaica. 
4. Tyromyces obductus (Berk.) Murrill. 
Polyporus obductus Berk. Lond. Jour. Bot. 4: 304. 1845. 
Pileus thin, sessile, fleshy, very fragile when dry, expanding from a wedge-shaped 
base, 6X12 0.3 cm.; surface very smooth, yellowish-brown, glabrous, with a gelatinous- 
horny pellicle, having the appearance of parchment; margin thin, concolorous, reniform- 
lobed : context very thin, white, fleshy-tough, becoming fragile and very hard when dry, 1 
mim, or Jess thick; tubes slender, 1.5-2.5 mm. long, white to yellowish within, collapsing, 
mouths angular, white to yellowish, minute, 6 to a mm., edges very thin, flaccid, lacerate: 
spores smooth, hyaline. 
TYPE LOCALITY: Boreal North America, below latitude 54°. 
HABITAT: Dead trunks. 
DISTRIBUTION : Known only from the type locality. 
5. Tyromyces Calkinsii Murrill, sp. nov. 
Pileus sessile, somewhat imbricate, dimidiate, convex above, concave below, cheesy 
when fresh, rigid when dry, 3-5 K 6-8 K 1.5-2 cm.; surface smooth, glabrous, azonate, 
white to cremeous or ochraceous-fulvous; margin thin or thick, entire or undulate, easily 
bruised, fertile: context white, homogeneous, fleshy to somewhat friable, very firm, 5-10 
mm. thick; tubes slender, white to ochraceous within, equaling the thickness of the con- 
text, mouths regular, angular, 3-4 to a mm., firm, white to yellowish and finally avel- 
Janeous, edges thin, entire to slightly dentate: spores globose, smooth, hyaline, 5y; 
hyphae 7 #; cystidia none. 
Type collected in Florida, on dead wood, December, 1886, W. W. Calkins 619. 
DISTRIBUTION : Florida. 
6. Tyromyces nivosellus Murrill, sp. nov. 
Pileus simple, imbricate, sessile, dimidiate, semicampanulate to ungulate, very thick 
behind, convex above, concave below, 3-5 X 6-9 X 2-4 cm.; surface smooth, glabrous, 
azonate, white or very slightly yellowish ; margin thick, usually obtuse, entire or undu- 
late, concolorous, darker when dry: context fleshy-tough, rigid, but slightly friable when 
dry, milk-white, 0.5-2.5 cm. thick; tubes long and slender, about 1 cm., white to dull- 
yellowish within, mouths regular, angular, 3 to a mm., white to isabelline or umbrinous, 
edges firm, rather thin, entire: spores ellipsoidal, smooth, hyaline, 3.5 X64. 
Type collected at the base of El Yunque, Cuba, on a royal palm trunk, March, 1903, ZL. MM. 
Underwood & F. S. Earle 1114. 
DISTRIBUTION : Cuba and Porto Rico. 
7. Tyromyces Smallii Murrill, sp. nov. 
Pileus compressed-ungulate, with a large umbo, broadly sessile, dimidiate, fleshy- 
tough, difficult to dry, 5-7 < 6-10 & 2-5 cm.; surface very smooth, glabrous, azonate, white 
to cremeous, changing to sordid-bay or blackish on drying: context fleshy-tough, zonate, 
watery, moist and flexible even in dried specimens, dull-white to sordid-avellaneous, tinged 
with flesh-color, 0.5-2.5 cm. thick; tubes 5-8 mm. long, 3 to a mm., rather large and 
irregular at times from the splitting of the dissepiments, partially collapsed, somewhat 
