58 NORTHERN POLYPORES 



i. LENZITES BETULINA (L.) Fries 



Pileus thin, coriaceous, sessile, dimidiate to flabelliform, 

 imbricate, conchate, 3-4 X 4-7 X 0.3-1 cm.; surface conspicu- 

 ously tomentose, velvety, multizonate, somewhat uneven, often 

 radiate-rugose to plicate, avellaneous with latericeous zones, 

 becoming olivaceous with age; margin thin, undulate to lobed at 

 times; context very thin, white, membranous, scarcely a mm. 

 thick; furrows slightly anastomosing when very young, 1-2 mm. 

 broad, 3-10 mm. deep, edges thin, entire to undulate, slightly 

 notched with age, cremeous within, ochroleucous to sordid- 

 ochraceous without; spores globose, smooth, hyaline, 6 /i. 



Extremely common throughout on various forms of dead de- 

 ciduous wood and rarely on coniferous wood. 



42. GLOEOPHYLLUM P. Karst. 



Hymenophore small, annual, epixylous, sessile; surface hairy 

 or glabrous, anoderm, often zonate; context tough, brown; 

 hymenium normally lamelloid or daedaleoid, but frequently 

 poroid in some species; spores smooth, hyaline. 



Context avellaneous to umbrinous, furrows about 0.5 mm. broad. I. G. trabeum. 

 Context ferruginous to castaneous, furrows about I mm. broad. 2. G. hirsutum. 



i. GLOEOPHYLLUM TRABEUM (Pers.) Murrill 



Pileus corky, rather soft, dimidiate, sessile, laterally connate, 

 plane or convex above, nearly plane below, 2 X 4-8 X 0.5-1 

 cm.; surface anoderm, tomentose, smooth or slightly tubercular, 

 usually azonate, opaque, isabelline when fresh, becoming avel- 

 laneous to umbrinous and finally fuliginous behind, changing 

 immediately to ferruginous or fulvous when bruised; margin 

 very thin, nearly entire, ochroleucous; context soft, punky, 

 homogeneous, dull-umbrinous, 1-3 mm. thick; tubes annual, 

 2-4 mm. long, ochroleucous to isabelline within, mouths irregular, 

 daedaleoid or radially elongate, averaging 0.5 mm. in width, 

 edges uneven, isabelline to grayish-umbrinous or fulvous, the 

 transverse walls often splitting with age and giving the hymenium 

 a lamelloid appearance; spores cylindric, smooth, hyaline, 9-12 

 X 3-4 /* 



Common throughout on dead deciduous and coniferous wood, 

 structural timbers in particular. 



2. GLOEOPHYLLUM HIRSUTUM (Schaeff.) Murrill 



Pileus hard, corky to woody, slightly flexible, imbricate, sessile, 

 laterally connate, often decurrent, oblong-dimidiate to flabelli- 



