1914) 
OVERHOLTS—THE POLYPORACEJE OF OHIO 99 
the context or the dark resinous color may be limited to a 
narrow line next to the hymenium or confined to two or three 
narrow zones in the context. It is difficult to distinguish these 
species with a white watery context and the writer's presenta- 
tion of them may be open to criticism. 
15. P. spumeus Sow. ex Fries, Syst. Myc. 1:358. 1821. 
Boletus spumeus Sow. Col. Fig. Eng. Fungi pl. 211. 1797. 
Pileus sessile, dimidiate, watery and fleshy-tough when fresh, 
firm when dry, 7-12 x 10-20 x 2-8 cm., much smaller on dry- 
ing, appearing appressed-tomentose, white or grayish, some- 
what yellowish or brownish on drying, azonate, margin rather 
thick but acute; context white, soft, spongy, and full of water, 
rather fragile on drying, more or less zonate, 1-3 em. thick; 
tubes 0.5-1.5 em. long, mouths white or yellowish on drying, 
angular, averaging 3 to à mm.; spores white, smooth, globose, 
ог subglobose, 4.5-5.2 v in diameter, distinctly uninucleate. 
Growing on injured or diseased deciduous trees, especially 
Ulmus and Acer. October and November. Rare. 
The plant is closely related to P. delectans Peck, with the 
same habitat and general appearance, but separated from that 
species by the smaller mouths of the tubes and by the distinctly 
uninucleate and more globose spores. Тһе plants so referred 
do not agree with the figure given by Sowerby, nor with Fries' 
description. My plants were determined by Bresadola. 
16. P. delectans Peck, Bull. Torr. Bot. Club 11:26. 1884. 
Pileus sessile, sometimes imbricate, dimidiate in outline, 
3-7 x 4-15 x 0.7-3 cm., rather spongy and watery when fresh, 
firm and rigid when’ агу, white or whitish, finely tomentose 
or glabrous, azonate, margin thin and acute; context white, 
in large specimens duplex, with a firm lower layer and a soft 
upper layer, in smaller specimens more uniform, 0.5-1.5 ст. 
thick; tubes 0.5-1.5 ста. long, mouths white, yellowish on dry- 
ing, circular to angular, large, averaging 1-2 to а mm.; spores 
white, smooth, ellipsoid to globose, 4.5-5.5 x 6.5-8.5 y. 
On diseased or injured trunks of deciduous trees, especially 
Acer; sometimes on logs of Fagus. September to December. 
Frequent. 
The species is separated from P. spumeus Sow. ex Fries 
by the larger tube mouths and the less globose spores that have 
