SAPROPHYTIC FUNGI OF EASTERN IOWA. 27 



and rugose, nearly glabrous, reddish yellow, subzonate towards 

 the margin; pores minute, angular, milky-white. Spores 



4X5- 



Not uncommon in damp woods, growing on the ground at 



the base of some stump or decaying tree. The tufts are 



sometimes very large 12 cm high, 12-20 or more in extent. 



The pileoli are flabelliform, very fragile, thin becoming grey 



or tawny when dry; pores very small. 



17. PoLYPORUs suLPiiuREUs i^BiiIIiard) /"r/W. 



Cespitose, multiple, moist cheesy; pileoli very wide, imbri- 

 cate, undulate, smoothish yellow with a tinge of red; pores 

 small, plane, sulphur-yellow; spores ovoid, papillate 7X5' 



Very common and very variable on rotten logs of all sorts, 

 generally yellowish or pale, but sometimes with quite bright 

 red stains above, below always when mature bright yellow. 

 When old the colors all disappear the lower surface becoming 

 brown. Much the same in texture and size as the preceding, 

 but easily known by its color, undulate margin and larger thin 

 walled pores. This species also has a bad reputation in the 

 forest. While not exactly a parasite it can yet destroy living 

 tissues on occasion, and once having found access through 

 some wound or break soon brings a living tree to naught. 

 N. A. F. 707. 



18. PoLYPORUS DISTORTUS ScJlZVCiuitz. 



Pilei confluent, distorted, ear-shaped, cervine, everywhere 

 covered with the soft, minute, white or pallid pores. 



Specimens here referred are shapeless; simply irregular 

 masses of fungal tissue where lobes and knots and tubercles 

 are covered by a porose hymenophore. Larger masses appear 

 stratose while smaller give indications of being made up of 

 many concrescent imbricate pileoli. The pores at first whitish 

 soon become cervine or brownish, at length also dentate or 

 lacerate. 



On and in the ground at the bases of stumps, dead apple- 

 trees etc.; not common. 



