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 atroseptatus T.Majewski MB#363459 Fig. 6G Polish Botanical Studies 7: 56 ( Majewski 1994b ) . – Type : “ On Limnebius aluta (Bedel) , Sw. Smolniki , 12.8.1974 , leg. A. Sarna ( T.M. 1482 – Holotype )”; KRAM . [ Poland ] Diagnostic features Main appendage axis with dark constricted septa separating secondary branchlets or antheridia from corner cells ( Fig. 6G , arrows); stout, not exceeding the perithecial apex, consisting of 9–12 flattened cells. [Detailed description: Santamaria 2003 ] Distribution and hosts Known from Poland ( type ) and Spain on Limnebius (Col. Hydraenidae ) ( Santamaria 2001a ). According to Majewski (2008) the record of Hydrophilomyces limnebii on L. aluta ( Balazuc 1990 ) from France probably belongs to H. atroseptatus . Collections examined from Denmark On Limnebius aluta Bedel, 1881 (Col. Hydraenidae ) DENMARK – Nordøstsjaelland (NEZ) • Storø i Gurre Sø ; 56°2.208′ N , 12°29.057′ E ; UC41; 7Apr. 2020 ; JP 1628 ; JP det.; ZMUC C-F-124366 . – Sydjylland (SJ) • Braenøre Mose ; 55°23.906′ N , 9°25.714′ E ; NG23; 5 Aug. 2018 ; JP 1168 ; JP det.; ZMUC C-F-123693 . Remarks First record from Denmark . The Danish material consists only of young thalli. Nevertheless the distinctive dark septa of this species confirm its classification ( Fig. 6G , arrows). Hydrophilomyces limnebii also occurs on Limnebius , but may be easily distinguished by the absence of dark septa in corner cells and by the strongly bent perithecium. A photo of H. atroseptatus is given here for the first time, although in immature condition.