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 Chaetarthriomyces spiralis Santam. MB#474853 Fig. 22C–D Nova Hedwigia 72 (3–4): 379 ( Santamaria 2001a ). – Type : “ Spain . Jaén : Santiago–Pontones , Parque Natural de Cazorla , Segura y Las Villas , río Aguamulas , below the head of Chaetarthria seminulum (Herbst) ( Coleoptera , Hydrophilidae ), 12.V.1990 , leg. S. Santamaria , BCB–Mycotheca SS·0945 [ Holotypus ]”; BCB . Diagnostic features Primary appendage strongly arcuate, consisting of up to 12 isodiametric cells culminated with a rounded uppermost cell. Perithecium with a blunt apex, with the wall cells spirally arranged and distinctively brown-pigmented ( Fig. 22D ). [Detailed description: Santamaria 2003 ] Distribution and hosts Grows on the underside of the head of Chaetarthria (Col. Hydrophilidae ) in Spain ( type ) and Poland ( Majewski 2008 ). Collections examined from Denmark On Chaetarthria seminulum (Herbst, 1787) (Col. Hydrophilidae ) DENMARK – Nordvestsjaelland (NWZ) • Flyndersø ved Dybesø ; 55°58.151′ N , 11°45.621′ E ; PH60; 4 Nov. 2017 ; JP 722 ; JP det.; ZMUC C-F-123214 . Remarks First record from Denmark . This species is much larger and significantly less frequent than C. crassiappendicatus . The development of two viable perithecia on the same thallus is exceptional ( Fig. 22D ).