NORTHERN POLYPORES 15 



opaque, finely spongy- tomentose ; margin thin, broadly sterile, 

 subentire; context white to pallid, 11.5 mm. thick, soft and 

 somewhat spongy, very fragile when dry; tubes decurrent, less 

 than i mm. long, white, mouths small, circular, angular, 4-5 

 to a mm., regular, edges entire to fimbriate-dentate. 



Found only at Rockport, Kansas, on decaying sticks and 

 chips. 



13. TYROMYCES ANCEPS (Peck) Murrill 



Pileus effused, resupinate or narrowly reflexed, inseparable 

 from the matrix, firm, sub-corky, slightly flexible, rigid when 

 dry, the reflexed portion 1-2 cm. long, extending laterally for 

 several centimeters by confluence, about I cm. thick behind; 

 surface minutely downy, sometimes rugosely pitted, milk-white 

 or slightly discolored, azonate; margin rather thin, acute, con- 

 colorous, undulate; context white, fleshy-tough, somewhat 

 fragile when dry, 5-8 mm. thick; tubes 3-5 mm. long, white to 

 pallid within, slender, mouths regular, even, circular, 5-6 to a 

 mm., glistening, white to very pale avellaneous, edges obtuse, 

 entire; spores globose, 5 fj.. 



Occasional on dead hemlock and balsam fir in New England 

 and New York. 



14. 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 i-i .5 ju. 



Common throughout on dead deciduous and coniferous wood. 



6. SPONGIPELLIS Pat. 



Hymenophore annual, epixylous, sessile, dimidiate, simple or 

 imbricate, rather large; surface white, anoderm, sodden and 

 bibulous; context white, duplex, spongy above, firm below; 

 hymenium concolorous, tubes thin-walled; spores smooth, 

 hyaline. 



