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A small (2.5-3.0 cm wingspan) dark grey-brown moth, darker and less contrastingly marked than the other Clostera species. It is most easily confused with small, dark specimens of C. apicalis. C. apicalis hase rusty-red or dark orange along the upper section of the postmedian line on the forewing; this is greatly reduced or absent in brucei. Clostera strigosa is larger with pale yellow mottling in the apical area, and C. albosigma has the dark terminal part of the forewing sharply divided from the remainder of the wing. Male antennae bipectinate; sexes similar.

Across southern Canada, from Quebec to coastal British Columbia, north to Yukon and south to New Jersey and California. In Alberta found mainly in the southern Boreal forest and foothills areas, but also present in the aspen parklands.