8 NORTHERN POLYPORES 



cm.; surface glabrous, indistinctly zonate, subshining, white to 

 pale-isabelline, latericeous behind, the zones tinged with pale- 

 latericeous; margin very thin, lobed, concolorous, glabrous; 

 context white, fibrous, I mm. thick; tubes slender, 2-3 mm. 

 long, white within, mouths regular, angular, 3 to a mm., edges 

 thin, firm, denticulate, white to pale-isabelline in dried speci- 

 mens; spores globose, 3 //. 



Collected once on dead wood at London, Ontario. 



7. CORIOLUS NIGROMARGINATUS (Schw.) Murrill 



Pileus confluent-effused, more or less imbricate, dimidiate, 

 applanate, corky-leathery, rather thick, flexible or rigid, 3-5 

 X 5-8 X 0.3-0.8 cm.; surface conspicuously hirsute, isabelline 

 to cinereous, concentrically furrowed and zoned; margin at 

 length thin, often fuliginous, sterile, finely strigose-tomentose, 

 entire or undulate; context white, thin, fibrous, spongy above, 

 1-4 mm. thick; tubes white, 1-2 mm. long, mouths circular to 

 angular, 4 to a mm., quite regular, edges thin, firm, tough, entire, 

 white to yellowish or umbrinous; spores cylindric, slightly 

 curved, 2.5-3 p.. 



Extremely common throughout on all forms of dead deciduous 



wood. 



8. CORIOLUS SUBCHARTACEUS Murrill 



Pileus rather thick, imbricate, dimidiate, conchate, rigid, 

 tough, 3-5 X 5-8 X 0.5-1.5 cm.; surface nearly smooth, finely 

 hirtose-tomentose, avellaneous, indistinctly multizonate; margin 

 cremeous, villose, thin, sterile, becoming black when bruised; 

 context white, radiate-fibrous, zonate, firm, 2-3 mm. thick; 

 tubes rather long, slender, 3-6 mm., white within, mouths 

 circular to angular, rather irregular with age, 2-3 to a mm., 

 edges at first thick, entire, becoming thin and finally lacerate- 

 dentate, white to avellaneous, glistening; spores ovoid, 5 p.. 



Occasional on dead poplar in Wisconsin, as well as in Colorado 

 and Utah. 



9. CORIOLUS MOLLIUSCULUS (Berk.) Murrill, comb. nov. 



Pileus effused-reflexed, imbricate, laterally connate, the 

 reflexed portion dimidiate, conchate, 2-5 X 5-12 X 0.3-0.7 cm.; 

 surface white, obscurely zonate, nearly smooth, somewhat silky, 

 fibrillose-tomentose; margin acute or obtuse, undulate to lobed; 

 context soft-corky, white, 1-2 mm. thick; tubes 3-5 mm. long, 

 white to discolored within, mouths large and irregular, variable 

 in size, averaging 2 to a mm., edges thin, lacerate-dentate, white 



