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We describe the new lichenized fungus Lasioloma antillarum Lücking, Högnabba & Sipman from the Netherlands Antilles. The new species is characterized by a corticolous growth habit, apothecia with shortly tomentose margins, and rather small (35–50 × 12–16 µm), muriform ascospores in numbers of 2(–4) per ascus. The material had originally been identified as Calopadia phyllogena (Müll. Arg.) Vězda, with associated sequence data, but in phylogenetic analyses consistently fell outside the latter genus. Its revised identification as a species of Lasioloma is consistent with its phylogenetic position and underlines the necessity of posterior annotations in public sequence repositories, in order to correct previous identifications. Citation: Lücking R., Högnabba F. & Sipman H. J. M. 2021: Lasioloma antillarum (Ascomycota: Pilocarpaceae), a new lichenized fungus from the Antilles, and the importance of posterior annotations of sequence data in public repositories. – Willdenowia 51: 83–89. Version of record first published online on 23 March 2021 ahead of inclusion in April 2021 issue. [ABSTRACT FROM AUTHOR]