1914) 
OVERHOLTS—THE POLYPORACEJE OF OHIO 91 
15. Pileus spongy and watery when fresh; context friable when dry; mouths of 
the tubes averaging 2-4 to à шіп............................ 27. P. nidulans 
15. Pileus firm and rigid; context corky when dry; mouths of the tubes minute, 
averaging БҰЗСА И а фео КЕ 48. Р. gilvus 
16. Plants growing on the wood of Alnus and Betula; spores light brown... 
49. P. radiatus 
16. Plants growing on the wood of Acer, Fagus, and other deciduous trees. . . 
50. P. cuticularis 
17. Context very light Бояп.................................. 46. P. resinosus 
17. Context yellowish brown or багКег................................... 18 
18. Surface of the pileus hirsute; plants growing on various diseased decid- 
TOE TOD. ow cece cece creer E 61. P. hispidus 
18. Surface of the pileus fibrillose or glabrous; plants growing only on the 
wood of Өиетсив............................................... 19 
19. Sporophore medium sized, less than 10 em. broad and 3 cm. ess ces ss 
53. P. dryophilus 
19. Sporophore large, more than 10 cm. broad and 3 cm. thick. . ..... 52. P. dryadeus 
1. P. versicolor L. ex Fries, Syst. Myc. 1: 368. 1821. 
Boletus versicolor L. Sp. Plant. 1176. 1753. 
Pileus sessile or effused-reflexed, imbricate or single, dimid- 
iate or encircling twigs and then often orbicular by confluence, 
2-5 x 2-7 x 0.1-0.3 cm., coriaceous, prevailing color grayish, 
but marked by many narrow, multicolored zones, ranging 
from white to yellow, brown, reddish, greenish, blackish, ete., 
villous or velvety, the margin thin and acute, usually sterile 
below; context white or whitish, fibrous, less than 1 mm. thick; 
tubes 1-2 mm. long, the mouths white or yellowish, sometimes 
somewhat glistening, circular to angular, averaging 3-5 to a 
mm., the walls thin, entire or slightly lacerate; spores white, 
smooth, oblong, sometimes curved, 1.2-2 х 5-6.3 и. 
On all kinds of dead wood. Common throughout the year. 
Easily distinguished by the multizonate, multicolored pileus. 
P. hirsutulus Schw. is often considered to be a form of this 
species. P. zonatus Fries, as reported by Morgan, is one of the 
many forms of it. The following references contain good illus- 
trations of our plant: Hard, Mushrooms f. 343., White, Hymen. 
Conn. pl. 36., and Moffatt, Higher fungi of the Chicago region 
рі: 17. 3.6. 
2. P. abietinus Dicks. ex Fries, Syst. Мус. 1: 370. 1821. 
Boletus abietinus Dicks. Fasc. Pl. Crypt. Brit. 3:21. 1793. 
Pileus sessile or effused-reflexed, dimidiate and broadly 
attached, or flabelliform and attached by the attenuate base 
