20 SOUTHERN POLYPORES 



12. MICROPORELLUS Murrill 



Hymenophore thin, annual, epixylous, usually flabelliform, 

 stipitate, the stipe variously attached and sometimes much 

 reduced; surface anoderm, multizonate; context thin, white, 

 fibrous, rigid and fragile when dry; tubes very minute, regular, 

 thin-walled, fragile when dry; spores smooth, hyaline. 



i. MICROPORELLUS DEALBATUS (Berk. & Curt.) Murrill 



Pileus thin, coriaceous, slightly flexible but easily broken, 

 flabelliform or spatulate, conchate, 2-6 X 3-7 X 0.1-0.2 cm.; 

 surface finely tomentose to glabrous, hirtose behind, radiate- 

 striate, dealbate, the zones often light-fulvous; margin very 

 thin, sterile, sericeous, undulate to lobed or cleft, inflexed and 

 often splitting when dry; tubes white to isabelline within, 

 scarcely a mm. in length, mouths minute, angular, 8-10 to a 

 mm., edges thin, entire, glistening, whitish when young, be- 

 coming discolored; stipe variable, often wanting, 0-7 cm. long, 

 2-7 mm. thick, scutate at the base, expanding into the pileus, 

 laterally attached, rarely eccentric, usually compressed, with 

 surface and substance resembling that of the pileus. 



Common throughout on dead wood, especially on buried wood, 

 and ranging northward into Kentucky and Missouri. The 

 form described as P. mutabilis is by far the most common, and 

 P. dealbatus appears quite different. Further study of the 

 genus is desirable. 



13. 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 cilia te; 

 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 not trumpet-shaped. 



Pileus less than 2 cm. in diameter, ochraceous; 

 tubes 2 to a mm., decurrent to the base of the 

 stipe. i. P. delicatus. 



Pileus more than 2 cm. in diameter. 



Pileus reniform, irregular. 2. P. fractipes. 



