June, 1911.] The Known Polyporaceae of Ohio. 
357 
is white, becoming more or less dingy with age, and is 
easily identified by its very disagreeable odor. When fresh 
and growing, the plant is soft and watery, but when dried it 
becomes exceedingly hard. Found during July and August. 
Perhaps not common. 
19. Tyromyces caesius (Schrad.) Murrill, N. Am. Flora 9 : 34. 
1907. 
Boletus caesius Schrad. 
Known as Polyporus caesius (Schrad.) Fr. The pileus is 
white with a bluish tinge. Probably rare. On dead limbs 
on the ground. 
20. Tyromyces semipileatus (Peck) Murrill. N. Am. Flora 
9 : 35. 1907. 
Polyporus semipileatus Peck. 
A doubtful species for Ohio. On deciduous wood. 
21. Tyromyces chioneus (Fr.) Karst. Rev. Myc. 3 9 : 17. 1881. 
Polyporus chioneus Fr. 
On deciduous wood. Rare. 
22. Tyromyces lacteus (Fr.) Murrill, N. Am. Flora 9 : 3G. 1907. 
Polyporus lacteus Fr. 
Probably rare. On beech wood. 
Illustration: Fries, Ic. Hymen, pi. 182, f. 1. 
23. Spongipellis unicolor (Schw.) Murrill, N. Am. Flora 9 : 37. 
1907. 
Boletus unicolor Schw. 
Also known as Polyporus obtusus Berk. Rare. On living 
maple trees. 
Illustrations: Rep. Mo. Bot. Gard. 10: pi. 13-16; Kalchbr. 
Ic. Hymen. Hung. pi. 34, f. 1. 
24. Spongipellis borealis (Fr.) Pat. Tax. Hymen. 84. 1900. 
Polyporus borealis Fr. 
This species is found only on the wood of the spruce tree. 
Rare in Ohio. 
25. Spongipellis delectans (Peck) Murrill, N. Am. Flora 9 : 38. 
1907. 
Polyporus delectans Peck. 
On living maple trees. Common. 
Illustration: Jour. Cine. Soc. Nat. Hist. 8 : 99. pi. 1. 
26. Spongipellis galactinus (Berk.) Pat. Tax. Hymen. 84. 1900. 
Polyporus galactinus Berk. 
On deciduous wood. Rare. 
27. Bjerkandera adusta (Willd.) Karst. Medd. Soc. Faun. FI. 
Fenn. 5 : 38. 1879. 
Boletus adustus Willd. 
