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 drusillae Santam. MB#834606 Fig. 85A–B Nova Hedwigia 110 (3-4): 359 ( Santamaria et al. 2020a ) . – Type : “ Spain , Barcelona , Mura , Riera de Nespres , 41°41′55″ N , 1°58′33″ E , 449 m a.s.l., 14.IX.1991 , S. Santamaria , on Drusilla canaliculata (Fabricius) ( Coleoptera Staphylinidae ), det. S. Santamaria , slide BCB-SS1099b ( HOLOTYPE )”; BCB . Diagnostic features Primary appendage simple or once branched above the basal cell. Cell III barrel-shaped, longer than broad, with a darkened outer margin. Two to four secondary appendages for each antheridium. Fourth tier of antheridium consisting of two prominent cells. Each antheridium including four phialides. Perithecial stalk cell narrower and darkened in its lower half. Distribution and hosts Recently described on Drusilla canaliculata (Col. Staphylinidae Aleocharinae ) from Spain ( type ), probably also from United Kingdom ( Weir & Beakes 1993 ) and from Poland ( Majewski 2008 ) where the records on the same host as the type were referred to M. homalotae . Collections examined from Denmark On Drusilla canaliculata (Fabricius, 1787) (Col. Staphylinidae Aleocharinae ) DENMARK – Nordøstjylland (NEJ) • Bønderskoven i Tofte Skov ; 56°49.955′ N , 10°14.981′ E ; NH79; 8–22 Aug. 2013 ; I. Aggerholm 934 ; JP det.; ZMUC C-F-123434 . Remarks First record from Denmark . As mentioned in the protologue, this species should be carefully compared with M. homalotae from which it may be distinguished by the constricted and darkened cell VI, the four phialides in the antheridium, and by the secondary receptacles showing constrictions at the septa separating the antheridial tiers. Also, its special ecology supports the distinctiveness of this species from others occurring on Aleocharinae rove beetles, such as M. britannicus and M. homalotae . Drusilla canaliculata is a rove beetle that catches ants (myrmecophagous).