NORTHERN POLYPORES 13 



6. TYROMYCES UNDOSUS (Peck) Murrill 



Pileus effused, narrowly reflexed, thin, fleshy-fibrous, soft 

 when fresh, rigid when dry, 5-8 cm. broad, 2-3 mm. thick, the 

 reflexed portion 0-7 mm. wide; surface slightly spongy-tomen- 

 tose, sulcate-zonate, white; margin very thin, undulate, inflexed 

 when dry; context white, very thin, fleshy-fibrous to fragile; 

 tubes 1-3 mm. long, white, mouths large, irregular, angular, 

 1-2 to a mm., edges very thin, fragile, lacerate, white to slightly 

 yellowish. 



Occasional on decaying trunks of hemlock and pine and more 

 rarely on deciduous wood in Maine, New York, and West 

 Virginia. 



7. TYROMYCES BALSAMEUS (Peck) Murrill 



Pileus thin, laterally elongate, fleshy to somewhat fragile, 

 dimidiate, decurrent, cespitose, 1.5-2.5 cm. long, extending lat- 

 erally 2-10 cm., 2-4 mm. thick; surface radiate-rugose, sub- 

 glabrous, slightly villose-tomentose behind, whitish or avel- 

 laneous varied with isabelline to fulvous zones; margin undulate 

 or subcrispate, irregular, acute, inflexed when dry; context white, 

 less than I mm. thick; hymenium uneven, somewhat cribrose; 

 tubes 1.5-2.5 mm. long, white to discolored within, mouths 

 angular, irregular, 3-5 to a mm., edges white to slightly dis- 

 colored, dentate to sharply lacerate. 



Occasional on trunks and stumps of balsam fir and hemlock 

 in Ontario and northern New York. T. crispellus (Peck) Murrill 

 is not distinct. 



8. TYROMYCES ELLISIANUS Murrill 



Pileus effused-reflexed, laterally connate, imbricate, fleshy, 

 tough to rigid, the reflexed portion dimidiate or laterally elongate, 

 1-2 X 2-5 X 0.5-1.5 cm.; surface uneven, pulverulent to glab- 

 rous or slightly scabrous, white to isabelline with narrow testa- 

 ceous zones, sometimes azonate; margin acute or slightly obtuse, 

 inflexed in dried specimens, white, entire or undulate; context 

 rather thick, firm and somewhat fragile when dry, white, about 

 5 mm. thick; tubes white to pallid or very pale latericeous 

 within, 3-5 mm. long, slender, mouths circular to slightly angular, 

 rather even, 5 to a mm., edges thin, white to isabelline or pale- 

 latericeous, entire or slightly dentate ; spores globose, 4 /x. 



Collected once on a dead pine trunk at Newfield, New Jersey. 



