4 NORTHERN POLYPORES 



plants of this group are difficult to separate from certain species of Polyporeae, 

 forms of Daedalea confragosa in particular being troublesome to the beginner. 

 On the other hand, there is little to cause confusion between this group and 

 the Fomiteae, if we except the single distinctly perennial species of Daedalea 

 and the daedaleoid forms of Porodaedalea. 



Context white or wood-colored. 



Hymenium labyrinthiform, often becoming lamellate or 



irpiciform. 



Hymenium very soon becoming irpiciform. 39. CERRENA. 



Hymenium rarely becoming irpiciform and then not 



until maturity. 40. DAEDALEA. 



Hymenium lamellate from the first, not becoming irpici- 

 form. 41. LENZITES. 

 Context brown. 



Hymenophore sessile, furrows radiate. 42. GLOEOPHYLLUM^ 



Hymenophore centrally stipitate, furrows concentric. 43. CYCLOPORUS. 



I. IRPICIPORUS Murrill 



Hymenophore annual, epixylous, sessile, effused-reflexed, 

 white or pallid throughout; surface anoderm, glabrous or velvety, 

 not distinctly zonate, margin acute; context white, coriaceous or 

 corky; hymenium hydnoid or irpiciform, with traces of shallow, 

 obsolete tubes near the margin; spores smooth, hyaline. 



Teeth i cm. or more long; pileus usually large and thick. i. 7. mollis. 



Teeth less than 0.5 cm. long; pileus thin and shortly reflexed. 2. 7. lacteus. 



i. IRPICIPORUS MOLLIS (Berk. & Curt.) Murrill 



Pileus sessile, dimidiate, imbricate, decurrent, 3-4 X 4-8 

 X 1-3 cm.; surface white, finely pubescent, azonate, sulcate at 

 times, often aculeate behind with age; context white, coriaceous, 

 1-5 mm. thick; tubes soon splitting into teeth, which are 1-2 

 cm. long, compressed to subulate, slender, more or less pointed, 

 dentate or incised, puberulent to glabrous, white to pale-flesh- 

 colored, about i mm. apart at the base; spores globose, 5-7 /JL. 



Frequent on dead or diseased trunks of deciduous trees through- 

 out, sometimes growing near the tops of trees. 



2. IRPICIPORUS LACTEUS (Fries) Murrill 



Pileus extensively effused, shortly reflexed, imbricate, dimidi- 

 ate, laterally connate, 0-1.5 X 1-4 X 0.1-0.2 cm.; surface white, 

 subzonate, concentrically furrowed in large specimens, villose; 

 margin very thin, deflexed, undulate to lobed; context mem- 

 branous, less than I mm. thick; tubes short, irregular, white to 

 isabelline, 1-3 mm. long, mouths angular, about 2 to a mm., 



