The new genus Edwardiella Henssen with the single species E. mirabilis Henssen is described in the Lichinaceae to include a holocarpous lichen. Colonies of the Gloeocapsa-phycobiont which are invaded by the fungal hyphae develop directly into apothecia or pycnidia. The apothecia are thallinocarps. The lichen was collected in the subantarctic Marion Island where it was mainly growing in lichenized tufts of Scytonema. Two new combinations, Gonohymenia nigritella (Lettau) Henssen and G. hondoana (Zahlbr.) Henssen are made.