Distribution: Northern North America.
Habitat: Temperate forests.
Substrate: Dead conifers.
Conservation Status: Not of concern
Narrow, elongated caps on dead wood. Fruitbody is off-white. Pores are small, angular, irregular, sinuous.
PNW Herbaria: Specimen records of Fuscopostia leucomallella in the Consortium of Pacific Northwest Herbaria database
CalPhotos: Fuscopostia leucomallella photos