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 Euphoriomyces unilateralis T.Majewski MB#459691 Fig. 11A–B Acta Mycologica 34: 13 ( Majewski 1999 ) . – Type : “ On Agathidium atrum (Paykull) (Col. Leiodidae ): Bialowieza Forest , sect. 638D, Circaeo-Alnetum , in litter, 24.7.1997 , leg. T. Majewski ( TM 7734 , - holotype- )”; KRAM . [ Poland ] Diagnostic features All the cells of receptacle (except the lower 4–7) divide unilaterally to form single sterile cells and perithecia. Antheridia borne distally on short branches of the appendage which continues the receptacle axis. [Detailed description: Santamaria 2003 ] Distribution and hosts On Agathidium (Col. Leiodidae ) from Poland ( type ) and Spain ( Santamaria 2001a ). Collections examined from Denmark On Agathidium atrum (Paykull, 1798) (Col. Leiodidae ) DENMARK – Nordøstsjaelland (NEZ) • Naerum ; 55°49.077′ N , 12°32.686′ E ; UB48; 1 Dec. 2019 ; JP 1567 ; JP det.; ZMUC C-F-124327 . On Agathidium seminulum (Linnaeus, 1758) (Col. Leiodidae ) DENMARK – Nordøstsjaelland (NEZ) • Geelskov ; 55°48.269′ N , 12°28.343′ E ; UB48; 10 Dec. 2018 ; M. Kofoed-Hansen 1270 ; M. Kofoed-Hansen det.; ZMUC C-F-123798 . Remarks First record from Denmark . In our opinion, E. unilateralis is a good species, well recognizable and distinguished from the similar E. agathidii by the narrow receptacle and by the absence of appendages and perithecia on one side.