Abstract
Lectotypes are designated for 23 basionyms relevant to New Zealand representatives of the fern family Hymenophyllaceae: Hymenophyllum alpinum Colenso, H. antarcticum C.Presl, H. cristulatum Rosenst., H. frankliniae Colenso, H. imbricatum Colenso, H. lyallii Hook.f., H. megalocarpum Colenso, H. oligocarpum Colenso, H. polychilum Colenso, H. pusillum Colenso, H. pygmaeum Colenso, H. rufescens Kirk, H. scabrum var. hirtum Colenso, H. spathulatum Colenso, H. truncatum Colenso, H. zeelandicum Bosch, Leptocionium sororium C.Presl, Sphaerocionium glanduliferum C.Presl, Trichomanes aureum Bosch, T. leptophyllum A.Cunn., T. multifidum G.Forst., T. polyodon Colenso, and T. venustula Colenso. Original material has also been identified for H. pyriforme Bosch but no lectotype designated. No type material has been found for Hymenophyllum aucklandicum Bosch. This article is a contribution towards clarifying the taxonomic and nomenclatural status of New Zealand plants for the plant names database (Ngā Tipu Aotearoa) and the electronic Flora of New Zealand.