Monacrosporium ullum sp. nov. the captures nematodes on adhesive spherical knobs was isolated from soil around Codonopsis lanceolata at Ulleung island, Korea. The spindle-shaped conidia sized 17-44 μm (26.5 μm) long, 7-10 μm (8.1 μm) wide, containing from 1 to 4 cross-walls but most often divided by 2 septa (47%). Resting bodies sized 57×30 μm. Arthrobotrys amerospora has almost spherical non-septate conidia with a small truncate protuberance at the base and sized 20-27 μm (23.3) μm long and 11-17 (14.1) μm wide. Conidiophores are somewhat longer 362.8 μm (311-418 μm) than its original description (75-250 μm).