descends unchanged into the trama. A genus midway between Lenzites 
and Trametes. * 
There are some species of Polyporus with sinuous or labyrinthiform 
pores; these, however, have narrow pores, and very thin dissepiments, 
without a conspicuous trama; and their substance is at first rather moist 
and spongy. 
A. Whitish , pallid , or fuscous etc., at least not as under B. 
D. ambigua Berk. Opaque white, as if whitewashed, zoneless, convex, 
glabrous, young parts sometimes pubescent; pore-surface pale tan or 
ochraceous, pores small, sinuose, edges obtuse, sometimes, however, with 
the character of Lenzites or of Trametes. A very common species in 
warm regions, distinguished mainly by the color of the pileus and pore- 
surface and by its white substance; it is often large, and generally 
flattened, and orbicular or reniform. Generally sessile, it sometimes has 
a short, often disc-like stem. The surface, occasionally somewhat shin¬ 
ing, is - often uneven and sulcate. The character of the hymenium is very 
variable, though often constant in a given locality, sometimes porous, 
again crowdedly lamelloid. The following are synonyms : T. incana 
Berk., T. lactea Berk., T. 'ambigua Fr., L. glaberrima B. & C., D. glaber- 
rima B. & C. and probably L. afplanata Fr., L. repanda Fr. and D. 
applanata Klotzsch. 
D. glaberrima B. & C. Polished white, with a short, but evident 
stem. A form of D. ambigua. 
D. quercina Pers. Pale wood-color, corky, rugulose, zoneless, uneven, 
rather smooth, of the same color within, porous at first; pores developing 
into winding or sinuate openings between contorted, thick, obtuse-edged 
lamellae. Our largest species; often imbricated and laterally extended. 
On oak chiefly, or chestnut. 
D. plumbea Lev. Coriaceous, sessile, depressed, zonate, unequal, bare, 
lead-color, sinuses much like those of D. quercina , but darker; substance 
concolorous. 
D. unicolor Fr. Villose-strigose, cinereous with concolorous zones ; 
hymenium with flexuous, winding, intricate, acute dissepiments, at 
length torn and toothed. Very common on deciduous trees. Often 
imbricated, fuliginous when moist; pores whitish cinereous, sometimes 
fuscous, variable in thickness, color, and character of hymenium ; some¬ 
times with a white margin. 
D. cinerea Fr. Thick subundulate, zonate, tomentose, cinereous; 
pores minute, obtuse, quite entire, some rounded, others very long, wind¬ 
ing, flexuous, intricate, white or cinereous. Perennial, stratose, near 
D. unicolor. 
D. tortuosa Cragin. Convex, often imbricated and confluent, strigose, 
pale yellowish brown, then smoother and paler, within concolorous, 
zonate; margin often ferruginous brown; hymenium pale cinnamon 
brown, generally effused at base, and abruptly subporous at the margin ; 
sinuses intricate, flexuous, torn and toothed, differing from those of 
D. unicolor in size and color. Perhaps a form of D. unicolor . 
D. subtomentosa Schw. Small, gibbous, whitish with raised subtomen- 
tose zones; sinuses poriform, narrow, white and pallid. Perhaps not 
distinct. 
D. confragosa (Bolt) Pers. Somewhat convex, scabrous, subzonate, 
unicolorous, fuscous-brick-color, within w r ood-color, becoming ferrugin¬ 
ous; hymenium porous, or narrowly labyrinthiform, cinereous-pruinose, 
then rufo-fuscous. On Crataegus, willow, and other trees. 
Several forms, best referred to this very variable species, have been 
placed by different authors in Lenzites or Trametes. Among these 
are Lenzites bicolor Fr., probably; L. Crataegi Berk.; L. Cookei Berk.; 
L. proximo Berk.; L. corrugata Klotzsch; Trametes rubescens (A. & S.) 
