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 Dioicomyces myrmecophilus T.Majewski MB#313129 Fig. 66F–I Acta Mycologica 9 (1): 115 ( Majewski 1973a ) . – Type : “On Myrmecoxenus subterraneus Chevrl. (Col., Colydiidae ): Sadówka , Nowy Dwór Mazowiecki county, in anthill of Formica rufa at edge of wood, … 8.1.1972 (TM. … Nr 913 – holotype ), leg. T. Majewski ”; KRAM . [ Poland ] [Host genus is now Myrmechixenus , and belongs to Col. Tenebrionidae ] Diagnostic features Female thalli with the perithecium showing an undistinguished neck and a broad, blunt, truncated apex which bears a finger-like, apically curved, sometimes uncinate outgrowth ( Fig. 66G , arrow) and a blunt prominence near the perithecial tip ( Fig. 66H , arrow). [Detailed descriptions: Majewski 1994b ; Santamaria 2002 ] Distribution and hosts Only known from Poland where the species was described on Myrmechixenus subterraneus (Col. Tenebrionidae ) a beetle that occurs in nests of Formica Linnaeus, 1758 ants. Collections examined from Denmark On Myrmechixenus subterraneus Chevrolat, 1835 (Col. Tenebrionidae ) DENMARK – Østjylland (EJ) • Ørnsø ; 56°9.446′ N , 9°31.488′ E ; NH32; 27 Sep. 1931 ; Johs. Andersen Dry0042 ; Johs. Andersen det.; ZMUC C-F-124108 . – Nordøstsjaelland (NEZ) • Grib Skov syd for Store Gribsø ; 55°58.486′ N , 12°18.521′ E ; UC30; 20 Jul. 2013 ; JP 124 ; JP det.; ZMUC C-F-122601 . Fig. 66. Dioicomyces spp. A –E . D. anthici Thaxt. A –C . Mature female thalli. In A, cells I, II and III are labelled. D–E . Male thalli. – F–I . D. myrmecophilus T.Majewski. F –H . Mature female thalli showing a finger-like perithecial outgrowth in G (arrow), and a blunt prominence near the perithecial tip in H (arrow). I . Male thallus. Scale bars: A–H = 50 µm; I = 25 µm. Photographs from slides ZMUC C-F-123463 (A–B, D–E), ZMUC C-F-122537 (C), ZMUC C-F-122601 (F–I). Remarks First record from Denmark and second world record after its description. This well-distinguished and characteristic species appears to be very rare in Denmark and elsewhere. Although the host is quite widespread and common in Denmark , the fungus is probably overlooked, especially when considering the host’s habitat preference.