Tricholoma nigrum  Shanks & Ovrebo (1996)                                                    *Collections: Oregon

This interesting Tricholoma seems to be indigenous to Oregon. Its most distinguishing features are the eroded gills with blackish edges that leave dark blackish squamules on the upper stem at times. These collections are from the Oregon Sand Dunes under Lodgepole Pine (Pinus contorta), which so far is the only known host. Its closest species seems to be T. luteomaculosum in stirps Luteomaculosum with which they share the same pseudoparenchymatous hypodermium