NORTHERN POLYPORES 9 



to discolored or light-bay; spores oblong, slightly curved, 7-9 

 X 2.5-3 M- 



Common throughout on dead deciduous wood. C. biformis 

 (Kl.) Pat. has been the usually accepted name for this species. 



10. CORIOLUS ABIETINUS (Dicks.) Quel. 



Pileus effused-reflexed, the reflexed portion thin, tough, flexible 

 to nearly rigid, 0.5-1.5 X 1-3 X 0.05-0.1 cm.; surface obsoletely 

 zonate, grayish-white, villose; margin thin, undulate to lobed, 

 fimbriate with age, incurved on drying; context very thin, white, 

 membranous; tubes uneven, irregular, soon becoming irpiciform, 

 mouths variable in size, 2-3 to a mm., edges thin, lacerate- 

 dentate, unequal, pallid or violet, fading with age, somewhat 

 flesh-tinted in dried specimens; spores globose, 4.5-5.5 /*. 



Extremely common throughout, especially northward, on 

 decaying coniferous trunks. 



ii. CORIOLUS PROLIFICANS (Fries) Murrill 



Pileus exceedingly variable, sessile or affixed by a short tubercle, 

 dimidiate to flabelliform, broadly or narrowly attached, 2-5 

 X 2-6 X 0.1-0.3 cm -! surface finely villose- tomentose, smooth, 

 white or slightly yellowish, marked with a few narrow, indistinct, 

 latericeous or bay zones; margin thin, sterile, entire to lobed; 

 context very thin, white, fibrous; tubes 1-3 mm. long, white to 

 discolored within, mouths angular, somewhat irregular, 3-4 to a 

 mm., usually becoming irpiciform at an early stage, edges acute, 

 dentate, becoming lacerate, white to yellowish or umbrinous. 



Extremely common throughout on dead deciduous trees, often 

 covering entire trunks. It is easily mistaken for one of the 

 Hydnaceae. 



4. CORIOLELLUS Murrill 



Hymenophore small, dry, annual, epixylous, semiresupinate ; 

 surface anoderm, usually azonate; context white, thin, fibrous 

 to corky; hymenium concolorous; tubes thin-walled, usually 

 rather large and irregular, dentate, but not irpiciform; spores 

 smooth, hyaline. 



Pileus white or pale-isabelline. I. C. Septum. 



Pileus fulvous to latericeous. 2. C. serialis. 



i. CORIOLELLUS SEPIUM (Berk.) Murrill 



Pileus small, dimidiate, laterally connate, narrowly attached 

 when young, becoming decurrent and of ten effused, 0.5-1 X 1-3.5 



