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 Monoicomyces bolitocharae T.Majewski MB#363457 Fig. 80C Polish Botanical Studies 7: 193 ( Majewski 1994b ). – Type : “ Holotypus : Poloniae, Bialowieza , super Bolitochara obliqua , 11.V.1990 , leg. T. Majewski ( KRAM , No TM 4822 )”; KRAM. [ Poland ] Diagnostic features Primary appendage unbranched, not exceeding in length the perithecial apices. Cell III inflated, dark brown. Thallus consisting of two divergent outwards dark brown secondary axes, which each include a series of 2–4 antheridia interspersed with perithecia or their initials. Antheridia dark brown except for the paler distal area, each bearing two dark brown apical secondary appendages. Stalk cell of perithecium narrowing and darkened near the base. Distribution and hosts Exclusive on Bolitochara obliqua (Col. Staphylinidae Aleocharinae ) from Poland , United Kingdom (Weir 1996), and Belgium ( De Kesel et al. 2020 ). Collections examined from Denmark On Bolitochara obliqua Erichson, 1837 (Col. Staphylinidae Aleocharinae ) DENMARK – Bornholm (B) • Svartingedalen ved Baggeå ; 55°11.740′ N , 14 45.260′ E ; VB81; 23 Jun. 2018 ; JP 1153 ; JP det.; ZMUC C-F-123677 . – Nordøstsjaelland (NEZ) • Fruebjerg i Strøgårdsvang ; 55°58.539′ N , 12°16.659′ E ; UC30; 18 Oct. 2018 ; JP 1219 ; JP det.; ZMUC C-F-123746 . Fig. 80. Monoicomyces spp. A –B . M. athetae Thaxt. Ascospores released from perithecia can be seen. A . Mature thallus showing a rudimentary secondary appendage (arrow). B . Mature thallus showing stalk cell of perithecium narrowing and darkening near the base (*) and rounded protuberance on one side of the perithecial tip (arrow). – C . M. bolitocharae T.Majewski. Mature thallus. Scale bars: 50 µm. Photographs from slides ZMUC C-F-123167 (A–B), ZMUC C-F-123746 (C). Remarks First record from Denmark . This spectacular species, belonging to the “ nigrescens group” ( Santamaria 1996c ), is unmistakable due to the particular organization of the antheridia and perithecia on the secondary axes. A photograph of this species is given here for the first time.