NORTHERN POLYPORES 59 



form, conchate, 2-3 X 4-8 X 0.3-1 cm.; surface zonate, strigose- 

 tomentose, anoderm, rather uneven, reddish-fulvous to fuliginous 

 or umbrinous; margin rather thick, sterile, isabelline, undulate, 

 finely tomentose, becoming acute and darker in age; context 

 soft-corky, homogeneous, fulvous, about 2 mm. thick; tubes 

 usually lamelloid, anastomosing when young, ochraceous to 

 grayish-umbrinous, 0.5-1 mm. broad, 2-5 mm. deep, edges 

 thin, undulate; in a poroid variety, tubes circular, regular, 2 to 

 a mm., edges thick, firm, entire; spores ellipsoid, smooth, hyaline, 

 8-12 X 3-4 M- 



Extremely common throughout on dead coniferous wood, and 

 rarely on deciduous wood. It is very destructive to coniferous 

 timber, and sometimes causes heart-rot in living trunks. 



43. CYCLOPORUS Murrill 



Hymenophore annual, tough, anoderm, terrestrial, centrally 

 stipitate; context soft, spongy, ferruginous; pores at first poly- 

 gonal, soon becoming continuous concentric furrows, dissepi- 

 ments thin, lamelloid; spores ovoid, smooth, ferruginous. 



i. CYCLOPORUS GREENEI (Berk.) Murrill 



Pileus circular, obconic to explanate, rarely cespitose, 5-10 

 cm. broad, 5-10 mm. thick at the center, much thinner at the 

 margin; surface undulate, zonate, tomentose to glabrous and 

 shining, ferruginous to fulvous, fuliginous-black in some old 

 plants; margin at first rounded, sterile, undulate, isabelline, 

 becoming very thin, darker, and somewhat eroded with age; 

 context spongy, fragile, zonate, ferruginous to fulvous, scarcely 

 I mm. thick in mature plants; tubes oblong-polygonal when very 

 young, soon becoming concentric furrows, 5-8 mm. deep, 1-2 

 mm. wide, undulate, pale-fulvous to fuliginous, edges isabelline 

 to umbrinous, very thin, uneven, splitting with age; spores ovoid, 

 smooth, pale-ferruginous, 5-6 X 10-12 /*; stipe central, enlarged 

 above, irregular, tomentose, fulvous to fuliginous, spongy and 

 brown within, 3-8 cm. long, 1.5-2 cm. thick. 



Occasional on the ground in woods from New England to 

 Iowa and southward. 



