Abstract A description is provided for Pochonia chlamydosporia . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Var. chlamydosporia is parasitic on cysts and eggs of the nematodes, and also ovicidal to Ascaris lumbricoides . Var. catenulata ( Cordyceps sp.) was also isolated from a coleopteran larva (ZARE et al. , 2001). HOSTS: INSECTA: Aphididae: Pentalonia (MATHEW et al. , 1998); var. catenulata also Coleoptera larvae (BIDOCHKA et al. , 1999). NEMATODA: cysts of Heterodera spp. (BURSNALL & TRIBE, 1974; WILLCOX & TRIBE, 1974; MORGAN-JONES et al. , 1981; GODOY et al. , 1982; GINTIS et al. , 1983; DACKMAN & NORDBRING-HERTZ, 1985; DACKMAN et al. , 1989; DACKMAN & BÅÅTH, 1989), galls of Meloidogyne spp. (LEIJ et al. , 1993; KERRY et al. , 1993, 1995; KERRY & EVANS, 1996), more rarely Globodera spp. (SAIFULLAH, 1996a, b ) and eggs of Ascaris lumbricoides (LYSEK & KRAJCI, 1987; LYSEK & STERBA, 1991). MOLLUSCA: snail and slug eggs (ZARE et al. , 2001). OOMYCOTA: oospores of Phytophthora (SNEH et al. , 1977; SUTHERLAND & PAPAVIZAS, 1991). FUNGI: antifungal activity of filtrates against Puccinia (LEINHOS & BUCHENAUER, 1992). GEOGRAPHICAL DISTRIBUTION: Both varieties are cosmopolitan; the teleomorph is only known from tropical countries. TRANSMISSION: Soil- and air-borne.