42 NORTHERN POLYPORES 



Common throughout, especially northward, usually on exposed 

 or burnt soil in woods. 



3. COLTRICIA FOCICOLA (Berk. & Curt.) Murrill 



Pileus membranous, circular, umbilicate, 3-6 cm. in diam- 

 eter, 0.5-1 cm. thick; surface velvety, cinnamon to cinereous, 

 multizonate; margin thin, entire or undulate; context very thin, 

 ferruginous to fulvous, scarcely I mm. in thickness; tubes long, 

 ample, ferruginous to fulvous within, 5-8 mm. long, mouths 

 1-2 mm. in diameter, angular, fulvous, edges thin, toothed, 

 becoming lacerate and collapsed with age, causing the pores to 

 appear much smaller than they really are; spores oblong-el- 

 lipsoid, smooth, pale-yellowish-brown, abundant, i-guttulate, 

 6 X 3.5 /*; stipe central, cylindric, slightly enlarged at the base, 

 velvety, ferruginous to fulvous, solid, corky, 2-3 cm. long, 3-5 

 mm. thick. 



Frequent on burnt soil in woods from Connecticut southward. 



4. COLTRICIA TOMENTOSA (Fries) Murrill 



Pileus circular, varying to dimidiate, sometimes cespitose, 

 6-12 cm. in diameter, 3-5 mm. thick; surface ferruginous-fulvous, 

 azonate, rarely subzonate, tomentose, plane or depressed at the 

 center; margin lighter in color, sterile, acute, entire to lobed; 

 context duplex, soft-corky, concolorous and spongy above, 

 corky-woody, fibrous and flavous-ferruginous below, 2-4 mm. 

 thick; tubes sometimes decurrent, about I mm. long, avellaneous 

 within, mouths small, equal, angular, 3-5 to a mm., covered at 

 first with a whitish substance, edges white, entire, becoming 

 grayish-umbrinous, very thin and toothed with age; spores 

 ellipsoid, smooth, pale-yellowish-brown, 5-7 X 2-4/1; cystidia 

 abundant, more or less curved, ovate-lanceolate at first, becoming 

 more slender, fulvous-brown, 50-75 X 6-15/1; stipe central to 

 lateral or wanting, unequal, obese, fulvous, tomentose, re- 

 sembling the context within, 0-5 cm. long, 5-15 mm. thick. 



Common throughout under coniferous trees, usually attached 

 to coniferous wood. 



5. COLTRICIA OBESA (Ellis & Ev.) Murrill 



Hymenophore simple or cespitose, sometimes connate; pileus 

 circular, convex to depressed, 4-6 cm. broad, 5-10 mm. thick; 

 surface fulvous, tomentose, azonate, smooth or pelliculose; 

 margin yellowish-cinnamon, obtuse, becoming acute, entire or 

 undulate; context homogeneous, soft, friable, fulvous, 4-8 mm. 



