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 Rhachomyces pilosellus (C.P.Robin) Thaxt. MB#192158 Fig. 18C–D Proceedings of the American Academy of Arts and Sciences 30: 467 ( Thaxter 1895 ) . – Basionym : Laboulbenia pilosella C.P.Robin, Traité du Microscope : 912 ( Robin 1871 ) [MB#566983]. – Type : [Not designated] “ On Lathrobium from an unknown locality in France ”. [According to Santamaria et al. 1991 , the type is an “ iconotype ”, i.e., the illustration given by Robin, which agrees with the ICNAFP – International Code of Nomenclature for Algae, Fungi and Plants ( Turland et al. 2018 )] Acanthomyces brevipes Thaxt. ( Thaxter 1893: 177 ) [MB#581132]. – Rhachomyces brevipes (Thaxt.) Saccardo ( Saccardo 1895: 454 ) [MB#188964] Diagnostic features Main axis short, consisting of 4–5 cells, continuing to a 3–4 celled lateral branch. A blackish diagonal strip is seen traversing from cell I to cell II ( Fig. 18C–D , arrows). Appendages “a” and “b” darkened, very elongated, yet coiled if undamaged ( Fig. 18C ). Type “c” appendages clustered below the perithecium. Perithecium very large, longer than main receptacle axis. [Detailed descriptions: Thaxter 1896 ; Majewski 1994b ; De Kesel 2002 ] Distribution and hosts Grows on Lathrobium (Col. Staphylinidae Paederinae ). An uncommon species only reported from France ( type ), Germany ( Thaxter 1893 ), Poland , Ukraine ( Siemaszko & Siemaszko 1932 ), Belgium ( Collart 1945 ), Italy ( Rossi 1975 ), and Hungary ( Bánhegyi et al. 1985 ). Collections examined from Denmark On Lathrobium fulvipenne (Gravenhorst, 1806) (Col. Staphylinidae Paederinae ) DENMARK – Fyn (F) • Gyldenstens inddaemmede Strand ; 55°34.447′ N , 10°7.211′ E ; NG75; 2 Apr. 2014 ; JP 687 ; JP det.; ZMUC C-F-123175 . – Sydsjaelland (SZ) • Østerskov ved Langebaek ; 54°59.572′ N , 12°6.715′ E ; UA19; 3 Jan. 2019 ; JP 1300 ; JP det.; ZMUC C-F-123833 . Remarks First record from Denmark . This is one of the earliest described species of Laboulbeniales .