Neolentinus ponderosus, commonly known as the giant sawgill,[2] or ponderous lentinus,[3] is a species of fungus in the family Gloeophyllaceae.

Found in western North America, it was originally described in 1965 as a species of Lentinus by American mycologist Orson K. Miller.

Its reddish-brown surface is made of small scales that are less dense in the upper half, where it has a more whitish or buff color.

The cystidia on both the faces and edges of the gills are thin-walled, hyaline (translucent), narrowly club-shaped, and measure 26–36 by 5–8.8 μm.

Fruit bodies grow singly or in small clusters,[9] and usually prefer open spots with direct sunlight.