Laboulbeniomycetes (Fungi, Ascomycota) of Denmark Author Santamaria, Sergi Unitat de Botànica, Departament de Biologia Animal, de Biologia Vegetal i d’Ecologia, Facultat de Biociències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès (Barcelona), Spain. sergi.santamaria@uab.cat Author Pedersen, Jan Natural History Museum of Denmark (Zoological Museum), University of Copenhagen, Universitetsparken 15, 2100 København Ø, Denmark. japedersen@snm.ku.dk text European Journal of Taxonomy 2021 2021-11-26 781 1 425 http://dx.doi.org/10.5852/ejt.2021.781.1583 journal article 10.5852/ejt.2021.781.1583 2118-9773 5828924 Hydrophilomyces gracilis T.Majewski MB#315332 Fig. 7D–E Acta Mycologica 10: 272 ( Majewski 1974 ) . – Type : “ On Cercyon granarius Er. (Col., Hydrophilidae ): Kurzeszyn Nowy , Rawa Mazowiecka county, on flooded meadows near the Rawka River , 18.8.1972 leg. T. Majewski ( TM. 1076 – holotype )”; KRAM . [ Poland ] Diagnostic features Receptacle slender, consisting of up to 44 flattened cells. Buffer cells absent. Perithecial neck straight. [Detailed description: Majewski 1994b ] Distribution and hosts On Cercyon (Col. Hydrophilidae ) from Poland ( type ), Greece ( Castaldo et al. 2004 ), and maybe from Belgium ( De Kesel et al. 2020 ). Collections examined from Denmark On Cercyon littoralis (Gyllenhal, 1808) (Col. Hydrophilidae ) DENMARK – Lolland, Falster, Møn (LFM) • Tjørnebjerg ved Kramnitse ; 54°41.586′ N , 11°16.980′ E ; PF46; 19 May 2019 ; JP 1463 ; JP det.; ZMUC C-F-124043 . – Nordøstsjaelland (NEZ) • Boserup Strand ; 55°40.086′ N , 12°1.806′ E ; UB17; 11 May 1900 ; coll. unknown Dry0031 ; unknown det.; ZMUC C-F-124101 . – Nordvestsjaelland (NWZ) • Bjerge Sydstrand ; 55°33.493′ N , 11°9.730′ E ; PG35; 1 May 2013 ; JP 300 ; JP det.; ZMUC C-F-122779 . On Cercyon marinus Thomson, 1853 (Col. Hydrophilidae ) DENMARK – Lolland, Falster, Møn (LFM) • Mandemarke ; 54°58.014′ N , 12°29.479′ E ; UA39; 8–13 Jun. 2013 ; O. Karsholt 178 ; JP det.; ZMUC C-F-122657 . Remarks First record from Denmark . According to the large quantity of Cercyon studied without success, this and the next species may be considered as very rare. This species grows on the tip of the elytra.