22 NORTHERN POLYPORES 



Pileus minutely tomentose or glabrous from the first. 

 Pileus large, 10 cm. or more in diameter; surface 



milk-white. 3- P- admirabilis. 



Pileus of medium size, 2-5 cm. in diameter. 



Context golden-yellow, not extremely thin; 



tubes remote from the stipe. 4. P. phaeoxanthus. 



Context whitish. 



Stipe central. 5- P- albiceps. 



Stipe lateral. 6. P. humilis. 



Margin of pileus ornamented with cilia, which often 



disappear with age. 7- P- arcularius. 



Stipe wholly or partly black or fuliginous, variously attached, 



usually darker than the pileus. 

 Pileus squamose, very large, flabelliform; tubes large, 



alveolar. 8. P. caudicinus. 



Pileus not as above. 



Pileus 12-25 cm. in diameter, white or pallid. 9. P. Underwoodii. 



Pileus rarely half this size and never white. 



Surface light-colored, isabelline to pale-ochra- 



ceous. 10. P. elegans. 



Surface dark-colored, bright-bay to almost black, n. P. fissus. 



I. POLYPORUS FAGICOLA Murrill 



Pileus circular, convex to plane, umbilicate, 4-5 X 0.1-0.3 cm.; 

 surface smooth, pale-avellaneous, ornamented with tufts of 

 innate fibrils, which are larger and darker near the center and 

 somewhat radially and imbricately arranged; margin very 

 sharp, slightly decurved, regular in outline, not ciliate; context 

 thin, fibrous, white; tubes milk-white, decurrent, favoloid, 1-2 

 to a mm., edges very thin, fimbriatulate; spores ellipsoid, 3-4 

 X 6-7 /r, stipe central, solid, thick, nearly equal, concolorous, 

 conspicuously hispid, especially near the base, 2 cm. long, I cm. 

 thick. 



Collected once on a beech log in Piscataquis County, Maine. 



2. POLYPORUS POLYPORUS (Retz.) Murrill 



Pileus circular, convex to plane, slightly umbilicate at times, 

 2-8 X 0.2-0.4 cm.; surface fuliginous, more rarely yellowish- 

 brown, hispid-squamulose to minutely hispid; margin at first 

 inflexed, thin, fimbriate, often becoming wavy or lobed; context 

 milk-white, membranous, 1-3 mm. thick; tubes adnate, white to 

 pallid, 1-2 mm. long, mouths circular, regular, 2-3 to a mm., 

 edges at first thick, becoming thin and often dentate with age; 

 spores cylindric, subcurved, 7-8 X 2-3 M; stipe central, solid, 

 woody, equal, squamulose, avellaneous, not black at the base, 

 2-3 cm. long, 3-7 mm. thick. 



