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 si2e 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 Mlirrill 



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 fj,', 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 ju; stipe central, solid, 

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

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



