Fusarium sp. NK-NH1 and Fusarium sp. NK-NH2 were cultured on PDA plates containing 0.04% (v/v) guaiacol at 28 °C for 6 and 12 days (Fig. 4a–b). Fusarium sp. NK-NH1 significantly degraded guaiacol on PDA-guaiacol plates, whereas Fusarium sp. NK-NH2 did not exhibit such activity. Fusarium sp. NK-NH1 thus exhibited a high capacity for lignin degradation.Figure 4Colony appearances of two isolates on PDA-guaiacol, CMC, and CMC Congo red plates. (a) Fusarium sp. NK-NH1 grown on PDA-guaiacol plates for 6 (left) and 12 days (right). (b) Fusarium sp. NK-NH2 grown on PDA-guaiacol plates for 6 (left) and 12 days (right). (c) Isolates grown on CMC plates for 4 days. (d) Isolates grown on CMC Congo red plates for 6 days.