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 Dimorphomyces myrmedoniae Thaxt. MB#215212 Fig. 73A–F Proceedings of the American Academy of Arts and Sciences 36: 409 ( Thaxter 1900 ) . – Type : “ On MYrmedonia flavicornis Fauv. , British Museum (Biologia Coll.), No. 766 , Guatemala ”; FH . Diagnostic features Male thalli consisting of a three-celled receptacle supporting a two-celled primary appendage, and a lateral flask-shaped compound antheridium. Female thalli consisting of an underlying cell I subtending a row of 6–14 cells; the first cell of the series (cell II) supports a three-celled primary appendage, where the two basal cells are inflated and separated by constricted and somewhat blackened septa, the distal cell narrower, longer, paler and often disintegrating. Perithecium with a ± perceptible tooth-like outgrowth near the apex ( Fig. 73B, E , arrows). [Detailed descriptions: Thaxter 1908 ; Majewski 1994b ; Santamaria 2003 ] Distribution and hosts On members of the genera Zyras Stephens, 1835 , Myrmedonia Erichson, 1837 , Tachyusa Erichson, 1837 (in part as Ischnopoda Stephens, 1835 ), Gnypeta Thomson, 1858 , Atheta Thomson, 1858 , and Dilacra Thomson, 1858 (Col. Staphylinidae Aleocharinae ). Type host is probably Zyras according to Majewski (1994b) . It has been reported from Poland , Spain and Guatemala ( Santamaria et al. 1991 ), USA ( Seymour 1967, on Myrmedonia ?), United Kingdom (Weir 1996), Italy , Greece ( Castaldo et al. 2004 ), Bulgaria , Switzerland ( Rossi et al. 2019a ), and Belgium ( De Kesel et al. 2020 ). Collections examined from Denmark On Dilacra vilis (Erichson, 1837) (Col. Staphylinidae Aleocharinae ) DENMARK – Lolland, Falster, Møn (LFM) • Lysemose ved Maribo ; 54°46.971′ N , 11°28.959′ E ; PF57; 4 Jun. 2018 ; JP 1133 ; JP det.; ZMUC C-F-123656 , C-F-123657 . Other material examined Type of Dimorphomyces myrmedoniae GUATEMALA • “ Dimorphomyces myrmedoniae , 2 slides from FH , #569, barcode 00313726, and #570, barcode 00313727, type , all over MYrmedonia flavicornis Fauv. , from Guatemala, ex British Museum coll. no. 766”; FH[00313726] [slide #569 apparently does not include thalli; slide #570 includes seven mature female thalli and two mature male thalli, in very poor condition ( Fig. 73F )] Remarks First record from Denmark . Thalli collected on Dilacra vilis from Denmark show a ± conspicuous protuberance near the perithecial apex, on the opposite side of where ostiole is found ( Fig. 73E , arrow). This feature is neither mentioned nor illustrated in any other previous records of D. myrmedoniae . We have reviewed the Spanish material kept in BCB, and all the thalli show this same character, which was overlooked in our previous observations ( Santamaria 2003 ). Figures and description by Thaxter (1908) do not show or mention this characteristic. To clarify if the American samples may perhaps correspond to a different species from those in Europe we have borrowed the type from FH (see above under other material examined). Unfortunately, the type slide is in very poor condition ( Fig. 73F ) and gives no additional information of interest. Given this situation, for the time being we should keep the European samples as they were classified.