14 SOUTHERN POLYPORES 



fibrous, fragile when dry, less than I mm. thick; hymenium 

 uneven, cribrose, especially behind; tubes slender, white to 

 discolored, 2-3 mm. long, mouths angular, 4 to a mm., white to 

 yellowish-discolored, edges thin, fimbriate-dentate to sharply 

 lacerate, presenting to the unaided eye the appearance of a 

 Hydnum; spores globose, 4 /x. 



Occasional on rotten logs in swamps in South Carolina. 



6. 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 p. 



Frequent in the southern Alleghanies on dead wood of both 

 deciduous and coniferous trees. 



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 /*. 



Frequent throughout on fallen dead branches of deciduous 

 trees. 



8. TYROMYCES CHIONEUS (Fries) P. Karst. 



Pileus imbricate, sessile, dimidiate, convex, 2-4 X 3-6 X I 

 cm.; surface sodden, grayish-cinereous or yellowish -white, 

 azonate, smooth, pubescent to glabrous, margin acute but rather 

 thick, entire, concolorous, fertile; context sodden and watery 

 when fresh, with a mild flavor and acid odor, white, homogeneous 

 and fragile when dry, cutting with a smooth surface, 7-10 mm. 

 thick; tubes shorter than the thickness of the context, 2-4 mm. 

 long, white to yellowish within, fragile, mouths even, glistening, 



