[in Russian with English abstract: ] The influence of the Hypogymnia physodes lichen crushed biomass on the germination and primary growth of weed seedlings – Poa annua, Echinochloa crus-galli and Setaria glauca was evaluated. The inhibition of the primary growth of weeds by lichen biomass was species-specific and depended on the amount of lichen biomass introduced. For Echinochloa crus-galli seeds, a delayed emergence of seedlings by 3 to 5 days and a lack of influence on germination were revealed. Poa annua seeds germination was suppressed by a high content of li-chen biomass (0,05 g/cm2); Setaria glauca – 0,01 g/cm2; 0,03 g/cm2 and 0,05 g/cm2. After 30 days of lichen biomass influence, the mass of Poa annua seedlings increased by 1/3 (0,01–0,03 g/cm2), and decreased by 2/3 (0,05 g/cm2 of lichen biomass). The Echinochloa crus-galli seedlings were about half weight, regardless of the amount of lichen introduced. The reduction in the mass of Setaria glauca seedlings (by 28,2–79,6%) depended on the amount of lichen introduced. The root systems growth was strongly suppressed for Poa annua and Echinochloa crus-galli seedlings; for Setaria glauca, an increasing stunting was noted. Poa annua shoot growth was stimulated by lichen biomass; and inhibited for Echinochloa crus-galli and Setaria glauca. Keywords: Hypogymnia physodes, biomass, weeds, germination energy, germination, primary root, primary shoot, mass of seedlings, inhibition of germination.