Pores are plane, minute, nearly round, pallid, yellowish-white.
The stem is eccentric, even, smooth, pallid; base from the first abruptly black. This is quite common on rotten wood in the forests. It resembles P. picipes both in appearance and habitat.
Polyporus medulla-panis. Fr.
Effused, determinate, subundulate, firm, smooth, white, circumference naked, submarginate, wholly composed of middle sized, rather long, entire pores, the whole becoming yellowish in age.
I found this species on an elm log along Ralston's Run.
Polyporus albellus. Pk.
The pileus is thick, sessile, convex or subungulate, subsolitary, two to four inches broad, one to one and a half thick, fleshy, rather soft; the adnate cuticle rather thin, smooth or sometimes slightly roughened by a slight strigose tomentum, especially toward the margin; whitish, tinged more or less with fuscus; flesh pure white, odor acidulous.
The pores are nearly plane, minute, subrotund, about two lines long; white, inclining to yellowish, the dissepiments thin, acute.
The spores are minute, cylindrical, curved, white, .00016 to .0002 inch long. Peck.
This species is quite common here and is very widely distributed in the United States.