[Vor. i 
132 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
black in weathered specimens, slightly encrusted, pulverulent 
to glabrous, azonate or marked with fine grayish zones, margin 
thick, deflexed and almost concealing the pores; context fulvous 
to golden brown rust-colored, floccose-fibrous, 1-4 mm. thick; 
tubes 2-4 mm. long, the mouths grayish, hoary brown, or 
umber, cireular, averaging 3-4 to a mm., the dissepiments 
thick and entire. 
On logs or trunks of deciduous trees, especially Fagus, Quercus, 
and Acer. Rare. 
A characteristic plant that will be recognized at sight. It 
is commonly known as ‘‘sweet knot" from the sweet, powerful 
odor that it is said to give off. 'The writer has made four 
different collections of this rare plant in different stages of 
growth but has never been able to detect the slightest semblance 
of а sweet odor. Тһе plant is exceptionally well illustrated by 
Lloyd (Мус. Notes, Polyp. Issue 3: f. 367-68; Syn. Stip. 
Polyp. f. 455), and Hard (Mushrooms f. 334). Тһе first and 
the last of the figures cited are upside down. 
9. F. conchatus Pers. ex Gill. Champ. Fr. 1:685. 1878. 
Boletus conchatus Pers. Obs. Myc. 1:24. 1796. Polyporus 
conchatus Fries, Syst. Myc. 1:376. 1821. 
Plants perennial, sessile, or more often effused-reflexed and 
frequently entirely resupinate; pileus dimidiate to conchate, 
0-7 x 4-12 x 0.2-3.5 cm., woody, grayish brown, yellowish 
brown or black, rarely encrusted, tomentose at least on the 
margin, becoming glabrous behind, zonate or concentrically 
sulcate and sometimes somewhat rimose, margin thin, mostly 
acute; context yellowish brown to dark brown, woody, 1.5-3 
mm. thick; tubes 1-2 mm. long, indistinctly stratified, mouths 
fulvous to dark brown, usually glistening, circular or subcircular, 
averaging 4-6 to a mm. 
On dead wood, rarely on living trees. Common. 
The plant is most frequently found entirely resupinate on 
old oak logs. Distinctly sessile forms are sometimes found, 
especially on living trees. The hymenium usually has a silky 
luster when viewed in changing positions, and on the whole 
the plant is so characteristic that when once recognized, the 
collector usually has no trouble with subsequent collections 
notwithstanding the fact that the species often presents great 
