98 MINNESOTA MUSHROOMS 



Polyporus adustus Smoky Polyporus 



C a ]) 5-10 cm. wide. ij;ray or smoky, more or less hairy, then smooth, tough, 

 woody when old, shelf-like; pores small, round, whitish, then dark gray, or black- 

 ish ; spores elliptic, 4-5 X 2/x. The name refers to the color. 



On decaying stumjjs. logs, etc. ; too tough to be of value. 



Polyporus gilvus Rustbrown Polyporus 



Cap 5-10 cm. wide, rust-brown or brown, tough, woody, smooth. une\en. shelf- 

 like; pores small, rust-brown. The name refers to the color. 



On decaying stumi)S. logs, etc., common everywhere; of no value. 



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B'^^^^," ^^ -lie.' 



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Figure 61. Polyporus umbell.atus 

 Polyporus cinnabarinus Orange Polyporus 



Cap 2-7 cm. wide, orange or vermilion, paler with age, smooth or downy, 

 wrinkled, slightly zoned, corky, shelf-like; pores round, bright vermilion. The 

 name refers to the color. 



Common on decaying wood ; of no value. 



Polyporus betulinus Birch Polyporus 



Cap 10-30 cm. wide, whitish-brown to reddish-brown, tough-fleshv. then corky, 

 smooth, zoneless, with a thin distinct skin, swollen, shelf-like; pores short, small. 

 white to brownish, with hair-like scales on the pore-surface when mature; spores 

 clear, oblong, curved, 4-5/i.. The name refers to its host. 



On roots and stems of birches; edible when young. 



I 



