The white gills and its decurrent form will distinguish it from P. lignatilis.
The gills are white, crowded, narrow at each end, decurrent.
decurrent: closely attached to and running down another body.
The gills are attached to the stem, often with a decurrent tooth, whitish.
The pileus is fleshy in the centre, and the gills thick and decurrent.
The gills are distant, decurrent, white, or slightly tinged with yellow.
Page 309Gills not decurrent, plants parastic on other mushrooms.
The gills are subdistant, adnate, or decurrent, white or creamy-white.
The gills are decurrent, distant, rather thick, often forked.
decurrent, said of the gills when they extend downward on the stem.