The succession specificity of microscopic fungi during plant waste decomposition in non-disturbed spruce forests and deciduous-coniferous cuttings of 2001/2002 has been studied. Complexes of micromycetes at cuttings largely differ from those in virgin forest communities - the Zhakkar index equals 0.29. The cutting misses numerous species of fungi which inhabit non-disturbed ecosystems. On the whole, species diversity of microscopic fungi at cittings is 2.0 times as less than that in non-disturbed spruce forests. The variation limits of microbe biomass at different plant waste decomposition stages were identified. Biomass of microorganisms was structurally dominated by mycelium and fungal spores (98-99 % of total biomass). Total biomass of microorganisms at cuttings was normally 1.4 time as less than that at virgin.