[Vor. 1 
104 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
the fresh plants but disappears on drying. Bresadola ascribes 
а subanise odor to the plant at times. Тһе plants are, however, 
closely related and one may expect to find intermediate forms 
that are difficult to refer to either species. Thin, semi-resupi- 
nate forms are often scarcely distinguishable from P. adustus 
Willd. ex Fries. Тһе plant is illustrated by Bresadola (Fungi 
Trident. pl. 135). 
25. P. robiniophila (Murr.) Overholts, n. comb. 
Trametes robiniophila Murr. N. Am. Flora 9:42. 1907. 
Plants annual, sessile, rarely imbricate; pileus dimidiate, 
fleshy-tough or somewhat coriaceous when fresh, firm and rigid 
when dry, 3.5-10 x 4-15 x 1-4 cm., white to cinereous or yel- 
lowish, finely tomentose to glabrous, azonate or rarely sub- 
zonate or concentrically sulcate in large specimens, margin at 
first thick and obtuse, becoming thin and acute when mature; 
context white, fleshy-tough when fresh, soft and punky when 
dry, 0.5-3 em. thick, usually with a sweet anise-like odor devel- 
oping in herbarium specimens; tubes 0.3-1 cm. long, mouths 
white, often bay or brownish in dried plants, circular to angular, 
averaging 4-6 to a mm., the walls thick and entire; spores 
white, smooth, ovoid to subglobose, 5.5-7 x 7-8.5 y. 
On deciduous trees, especially Robinia, Celtis, and Acer. 
August to December. Common. 
Dried plants are characterized by the tough, punky context 
and the sweet odor, as well as by the large size of the plant, 
the long tubes, the minute mouths, and the habitat. The plant 
was first described as a Trametes but it appears to belong rather 
to Polyporus. 
26. P. betulinus Bull. ex Fries, Syst. Мус. 1:358. 1821. 
Boletus betulinus Bull. Herb. Fr. pl. 312. 1786. 
Pileus sessile or attached by a prominent lateral umbo, dimidi- 
ate to circular in outline, 3-9 x 3-15 x 1-5 cm., somewhat 
fleshy when young, firm and rigid when dry, glabrous, azonate, 
smooth, covered with a thin pellicle, margin more or lessincurved, 
with a wide sterile band on the lower surface; context white, 
somewhat fleshy when fresh, soft-corky when dry, 1-3.5 em. 
thick; tubes 3-8 mm. long, mouths white, circular to angular, 
averaging 3-4 to a mm.; hymenium at times covered by pro- 
jecting setae, sometimes as much as 2 mm. long; tubes separat- 
