| The nematode-trapping fungi are those fungi that can capture nematodes with special trapping structures, so-called constricting rings, non-constricting rings, adhesive nets, adhesive knobs, adhesive hyphae, adhesive branches and stephanocyst to capture nematodes. Our interests of studying nematophagous fungi are due to the fact that they can be used as biological control agents of parasitic nematodes. An investigation was undertaken in order to evaluate the distribution of nematode-trapping fungi in different locations in Guangxi during Nov. 2003 to Mar. 2005, 112 soil samples were collected from ten sites of 6 different regions. And 185 isolates of nematode-trapping fungi were isolated from the samples. Based on conidia morphology and trapping organs, they were identified as belonging to 23 species of Arthrobotrys, Monacrosporium and Dactyellla. Among of them, Arthrobotrys guangxiensis is a new species, Monacrsoporium haptotylum var. nanningum is a new variety, Arthrobotrys amerospora and Monacrosporium megalosporum are recorded for the first time from China, Arthrobotrys oligospora, Arthrobotrys javanica, Arthrobotrys polycephala, Arthrobotrys robusta, Arthrobotrys superba, Arthrobotrys vermicola, Dactylella beijingensis, Dactylella leptospora, Monacrosporium candidum, Monacrosporium cystosporium, Monacrosporium drechsler,Monacrosporium fusiformis, Monacrosporium haptotylum, Monacrosporium longiphorum, Monacrosporium phymatophagum and Monacrosporium thaumasium are reported for the first time from Guangxi. A. oligospora, A. musiforis, M. fusiformis and M. cystosporium are pre-dominant species in most sampling sites, and the frequent occurring species is A. oligospora. The phylogenetic relationship among the species of Guangxi and the related species were also carried out base on the sequences of the internal transcribed spacer regions (ITS, including 5.8S rDNA), the species were separated according to the trapping organs instead of the traditional genera concept.
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