TROPICAL POLYPORES 23 



10. TYROMYCES CINCHONENSIS Murrill 



Pileus imbricate, flabelliform, attached by a narrow base, con- 

 vex above, concave below, slightly flexible, becoming rigid and 

 fragile when dry, 2.5 X 2.5 X 0.2-0.3 cm.; surface milk-white, 

 becoming suffused with avellaneous or very pale ardesiacous 

 markings, perfectly glabrous, radiate-rugose; margin thin, un- 

 dulate or eroded, deflexed on drying, concolorous; context white, 

 thin, fibrous, rather tough for the genus; tubes white, much 

 longer than the thickness of the context, averaging about 2 mm., 

 mouths angular, regular, white with an ashy tint, glistening, 5-6 

 to a mm., edges thin, becoming slightly lacerate-dentate ; spores 

 cylindric, curved at times, 4 X 1.5-2.5 p. 



Collected twice at Cinchona, Jamaica, on dead coniferous wood. 



ii. TYROMYCES LACTEUS (Fries) Murrill 



Pileus dimidiate, sessile, decurrent, convex, very soft, fleshy, 

 becoming rigid when dry, 2-4 X 5-8 X 0.5-1.5 cm.; surface 

 milk-white, sometimes slightly discolored, azonate, finely tomen- 

 tose 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, 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,4~5 X 1-1.5 /* 



Found on dead wood in the Tepeite Valley, near Cuernavaca, 

 Mexico, at an elevation of 2300 m. 



12. TYROMYCES LEUCOMALLUS (Berk. & Curt.) Murrill 



Pileus soft, fleshy, very fragile when dry, dimidiate, sessile, 

 convex, 3-5 X 5-8 X 0.5-1.5 cm.; surface white to slightly 

 cinereous, 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, sub- 

 glistening, very thin and dentate to slightly lacerate. 



Occasional on dead wood in Cuba, western Jamaica, and 

 eastern Mexico. 



