This study reports the fuel weight and biomass distribution in a 51-year-old lowland and 55-year-old upland black spruce (Picea mariana [Mill.] B.S.P.) stand in interior Alaska. Biomass distribution is shown for overstory, stand and down dead tree components, herbaceous understory, and the moss layer. The lowland stand contained over 11 000 stems/acre (27 170 stems/ha) and 82ft^2 of basal area pre acre (18.8m^2 of basal area per hectare), and the upland stand contained 6000 stems/acre (14 820 stems/ha) and 96 ft^2 of basal area per acre (22.0 m^2 of basal area per hectare). Moss layers contributed 54.6 and 45.5 t/acre (120.1 and 100.1 metric t/ha) to biomass totals in the lowland and upland sites, respectively. Total biomass was 64.7 t/acre (142.3 metric t/ha) in the lowland site and 58.0 t/acre (1127.6 metric t/ha) in the upland site.