NORTHERN POLYPORES 21 



i. HEXAGONA ALVEOLARIS (DC.) Murrill 



Pileus reniform to circular, convex-plane, depressed behind, 

 3-4 X 5-7 X 0.2-0.5 cm.; surface at first fulvous, strigose- 

 squamose, at length pallid and almost glabrous; margin at first 

 thin, entire, incurved, becoming thicker and undulate or lobed; 

 context white, opaque, 1-2 mm. thick; tubes decurrent, white to 

 pallid, 2-4 mm. long, mouths 1-1.5 X 2-3 mm., edges thin, 

 rigid, dentate; spores ellipsoid, 10-14 X 4~4-5 M! stipe usually a 

 lateral tubercle, at times eccentric or central, varying in length. 



Common throughout on fallen branches and other forms of 

 dead deciduous wood. 



2. HEXAGONA STRIATULA (Ellis & Ev.) Murrill 



Pileus flabelliform to reniform or rarely circular, convex, usu- 

 ally umbilicate or depressed behind, 2-4 X 2.5 X 0.2-0.4 cm.; 

 surface smooth, glabrous, straw-colored to cream-colored; margin 

 acute, undulate or slightly lobed, rarely reflexed, irregularly 

 denticulate, dark-brown, as if scorched; context white, 1-2 mm. 

 thick; tubes decurrent, ochraceous, 1-2 mm. long, mouths 4-6- 

 angled, 0.3-0.5 X 0.6-1 mm., edges rather firm, beset with 

 small, sharp teeth; spores ellipsoid, 3 X 9 v, stipe lateral to 

 eccentric, rarely central, slightly enlarged below, concolorous, 

 minutely tomentose to subglabrous, 1-7 mm. long, 3-5 mm. 

 thick. 



Frequent throughout on dead trunks and fallen sticks of 

 birch, beech, and certain other deciduous trees. Possibly only 

 a variety of H. alveolaris. 



12. POLYPORUS (Micheli) Paulet 



Hymenophore annual, epixylous, small and simple, very rarely 

 large and compound; stipe central, eccentric or lateral, much 

 reduced at times in a few species, often partly or wholly brown 

 or black; surface usually smooth, the margin at times ciliate; 

 context white or yellowish, fibrous, tough to corky; hymenium 

 porose, at times alveolate; spores smooth, hyaline. 



Stipe pallid or light-brown, centrally attached, not darker 



than the pileus. 

 Margin of pileus devoid of cilia. 



Pileus ornamented with conspicuous tufts of fibrils, 



which are larger and darker toward the center. i. P. fagicola. 



Pileus plainly villose, often becoming glabrous with 



age. 2. P. Polyporus, 



