Summary:
Features include a nearly spherical, dirty white fruitbody with a peridium that tends to disappear, a spore mass that is firm and finally friable, colored ochraceous buff, the cavities polyhedral and filled with spores, a sterile base present but columella not seen, and microscopic characters including round spores 7-8 microns in diameter with very large verrucae, 9-10 per great circle. It is rare in the Pacific Northwest (Trappe(13)).

Interior:
firm, finally friable; ochraceous buff; "cavities polyhedral, filled with spores", (Dodge)

Microscopic:
spores 7-8 microns, round, with very large verrucae, 9-10 per great circle; basidia clavate, soon collapsing and evanescent; "septa of loosely woven, slender hyphae in a gel, thin, 20-30 microns thick"; peridium about 100 microns thick, pseudoparenchymatous, cells up to 200 x 30 microns, very thin-walled, (Dodge)

Notes:
Sclerogaster pacificus has been found in southern BC and coastal OR, (Trappe(13)). The holotype is from OR (Zeller).