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SUMMARY
Six marine Ascomycetes and four Fungi Imperfecti were discovered on Easter Island (southern Pacific Ocean) on driftwood, intertidal wood, and washed-up algae (Zonaria sp.). All are new records for this island, and most of them are new records for the South Pacific. Ascospores of sand-inhabiting fungi occur in sea foam. The marine mycota of Easter Island is considered tropical to subtropical. Thalassoascus lessoniae sp. nov. is a parasite on holdfasts of Lessonia nigrescens on the coast of central Chile. The new binomial T. cystoseirae is proposed and a key to the species of Thalassoascus is provided.