[Vor. 1 
144 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
deedaloid and sinuous, but soon breaking up into teeth—though 
retaining the sinuous character at the margin of the pileus—, 
averaging about 2 to a mm. 
On dead wood. Common. 
This plant may at first prove puzzling to the collector, as it 
was to me when first collected, for the thin, flexible pileus and 
the usually toothed hymenium indicate a close relationship with 
the thin coriaceous species of Polyporus, or even with Гтрех. 
But the pores are decidedly sinuous, at least in young plants. 
Тһе thin pileus and the hirsute or villous pubescence separate 
the species from other members of the genus. 
2. D. ambigua Berk. Lond. Jour. Bot. 4:305. 1845. 
Trametes lactea Berk. Hooker's Lond. Jour. Bot. 4: 305. 1845. 
Plants annual or rarely reviving for two or three years, sessile, 
sometimes appearing substipitate; pileus dimidiate to reniform, 
3-14 x 5-20 x 0.3-1.5 cm., slightly flexible when fresh, сотку 
when dry, pure white to umbrinous, sometimes purplish black 
at the base, minutely velvety to glabrous, azonate or subzonate 
on the margin, margin rather thin, acute; context white or pal- 
lid, floccose-punky to corky, 0.2-1 em. thick; tubes 2-4 mm. 
long, sometimes stratified in two or three layers, mouths whit- 
ish or yellowish, circular to sinuous and dedaloid, never lamellate, 
averaging 2-3 to a mm. in transverse direction, walls rather 
thick and entire. 
On stumps and trunks of deciduous trees. Common. 
Distinguished from D. confragosa Bolt. ex Fries by the white 
color, the white context, the smaller pores and the habitat. 
Hard (Mushrooms /. 355-56) gives excellent illustrations of the 
plant. 
3. D. confragosa Bolt. ex Fries, Syst. Мус. 1:336. 1821. 
Boletus confragosus Bolt. Hist. Fung. Suppl. 3:160. 1791. 
Lenzites Crategi Berk. Hooker's Lond. Jour. Bot. 6: 323. 1847. 
Plants annual, sessile; pileus dimidiate, 2-10 x 3-15 x 0.2-1.5 
cm., slightly flexible to rigid, grayish or cinereous, rarely slightly 
brownish, minutely tomentose to glabrous, zonate, margin thin 
and acute; context whitish, floccose to corky, 0.2-1 cm. thick; 
tubes 0.1-1 em. long, mouths whitish to cinereous, sometimes 
slightly reddish, darker when bruised, subcircular at times but 
usually sinuous, dzedaloid, or labyrinthiform, sometimes becom- 
