22 TROPICAL POLYPORES 



7. TYROMYCES SEMIPILEATUS (Peck) Murrill 



Pileus effused, largely resupinate, suborbicular or laterally 

 elongate, very narrowly reflexed, the reflexed portion o-i X 2-5 

 X 0.3-0.5 cm.; surface white or pale-isabelline, subvillose or 

 scabrous, azonate; margin thin, undulate, sometimes inflexed; 

 context white, fleshy-tough to fragile, 2-4 mm. thick; tubes 

 short, slender, white to yellowish within, mouths minute, circular 

 to slightly angular, scarcely conspicuous, 7 to a mm., edges 

 thin, very even, entire, white to pallid, often bluish-discolored 

 in spots or blotches ; spores subglobose, 6-8 /x. 



Found on dead wood in the Tepeite Valley, Mexico, at an 

 elevation of 2300 m. 



8. TYROMYCES CAESIUS (Schrad.) Murrill 



Pileus dimidiate, imbricate, often narrowly attached, with a 

 prominent umbo, variable in habit and size, soft, spongy when 

 fresh, fragile when dry, 1-2 X 3-6 X 0.5-1.5 cm.; surface sod- 

 den, tomentose or villose-tomentose, azonate, murinous or 

 griseous when fresh, becoming caesious or fading to nearly pure- 

 white on drying, often nearly glabrous with age; context white, 

 soft, friable, 5-8 mm. thick; tubes long and slender, 5-10 mm. 

 long, caesious within, collapsing, friable, mouths angular, 3-4 

 to a mm., edges white or bluish -gray, very thin, dentate to long 

 and sharply lacerate; spores elongate, 5-5.5 X 1.5 At. 



Abundant on dead branches and trunks of Juniperus at 

 Cinchona and New Haven Gap, Jamaica, and found also at 

 Castleton, Jamaica, and in the Tepeite Valley, Mexico. 



9. TYROMYCES SEMISUPINIFORMIS Murrill 



Pilei very abundant, imbricate, semiresupinate, the reflexed 

 portion dimidiate or laterally extended, sometimes cuneate, 

 convex above, slightly concave below, thin, very tough, 1-1.5 cm - 

 long, about 1.5 cm. broad, larger by confluence, 1-3 mm. thick; 

 surface slightly sulcate-zonate, dull-ochroleucous behind, stra- 

 mineous in front, glabrous, somewhat uneven, margin thin, 

 sterile, undulate or lobed; context very thin, white, rigid when 

 dry, only slightly friable; tubes ochroleucous, cremeous near the 

 margin; mouths very minute, invisible to the unaided eye, 

 circular to angular, edges entire, obtuse, becoming thin. 



Collected once on the side of a large log in a moist virgin forest 

 near Jalapa, Mexico. 



