A new nematophagous hyphomycete is described from the Canary Islands as Arthrobotrys hertziana. It has branched conidiophores
with slightly swollen tips, mostly three-septate conidia, and sticky knobs as trapping devices. A key to Arthrobotrys species forming
sticky knobs is presented. Among six nematode and two springtail species tested as hosts only the nematode Panagrellus redivivus
was trapped. The results are discussed with reference to taxonomical problems and the possibly limited host range.