NORTHERN POLYPORES 31 



white, 2-3 mm. long, mouths circular and regular when young, 

 3 to a mm., often large and angular with age, edges white, thin, 

 entire to lacerate; spores subglobose to ellipsoid, smooth, hyaline; 

 stipe tubercular, white, connate-ramose. 



Common throughout at the base of oak trees, causing serious 

 decay. Edible when young. 



4. GRIFOLA RAMOSISSIMA (Scop.) Murrill 



Pileus imbricate-multiplex, densely clustered, squarrose, um- 

 bellate, 12-20 cm. broad; pileoli very numerous, quite regular, 

 circular in outline, depressed at the center, 1-4 cm. in diameter; 

 surface usually fuliginous, sometimes light-brown or even white, 

 fibrillose, very rugose when dry; margin thin, inflexed; context 

 white, fibrous, very thin, fragile when dry; tubes decurrent, 

 shallow, mouths angular, 2-3 to a mm., edges thin, entire to 

 lacerate; spores oblong, 9-10X3-4^; stipe tubercular, with 

 long cylindric branches, which are white and usually entirely 

 covered with tubes. 



Occasional at the base of oak trees throughout most of the 



region. 



5. GRIFOLA BERKELEYI (Fries) Murrill 



Pileus imbricate-multiplex, 15-50 cm. broad, 10-20 cm. high; 

 pileoli very broad, applanate to infundibuliform, thin, 5-15 cm. 

 broad, 5-15 mm. thick; surface white to obscurely alutaceous, 

 subtomentose, rugose-undulate; margin acute, undulate to 

 lobed, sterile, often inflexed; context white, tough, fragile when 

 dry, homogeneous, milky in young plants, 5-10 mm. thick; 

 tubes decurrent, white, unequal, 2-5 mm. long, mouths angular, 

 about i mm. broad, edges soft, white, entire, very fragile when 

 dry; spores globose, roughly echinulate, 6-8 /*; stipe short, 

 tubercular, 5-10 cm. thick. 



Frequent throughout at the base of oak trees, causing serious 

 decay. In Idaho, this species also attacks the roots of the larch. 



6. GRIFOLA PECKIANA (Cooke) Murrill, comb. nov. 



Pileus fleshy, tenacious, usually somewhat cespitose-multiplex, 

 circular to eccentric or infundibuliform, often depressed, 5-10 cm. 

 broad; surface luteous lightly marked with obscurer lines, gla- 

 brous or slightly villose, especially on the disk, margin thin, 

 concolorous, usually undulate or lobed, inflexed when dry; con- 

 text fleshy, very fragile when dry, white, 1-2 mm. thick; tubes 

 decurrent, white to yellowish, 1-2 mm. long, mouths small, 

 angular, 4-5 to a mm., edges thin, fragile, fimbriate; stipe usually 



