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Wingspan 20-26 mm. Forewings extensively dusted with light bluish gray. PM line with weak triangular expansions of the veins. Hind wings above gray. The genitalia are described in Munroe (1976). Closest to L. cereralis but smaller, darker, lacking noticeably expanded veins in the forewings, and in bogs, not in open grassy areas.

In Fennoscandia and the northeastern part of Russia; also in North America where is has been found from Nova Scotia, Newfoundland and Labrador west to the Yukon (Munroe 1976). Type Locality St. Martin's Falls, Albany River, Hudson's Bay. Reported from Areas 19 (Banff National Park), 20 (Nordegg) and 21 (Jasper National Park) in Alberta by Bowman (1951) but Nordegg material called L. commixtalis in UASM was actually of L. cereralis. Kenneth Bowman specimens of L. cereralis, collected in Banff, Edmonton, Jasper and Nordegg were misidentified as L. commixtalis. In Alberta, known from the Wagner Natural Area and Richardson River Dunes Provincial Park.