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 Cantharomyces italicus Speg. MB#159942 Fig. 76C–F Anales del Museo Nacional de Historia Natural de Buenos Aires 27: 42 ( Spegazzini 1915b ) . – Type : “Sobre el margen superior posterior del abdomen de Dryops ( Parnus ) algiricus , cazados en el torrente Monticano , Conegliano , Oct. 1913 ”; LPS . [ Italy ] Diagnostic features Thallus slender. Cell II pale, without blackening, sometimes slightly darker than cell I. Septum separating cells I and II not constricted. Cell VI strongly constricted at the middle ( Fig. 76D ).Antheridium occupying the side of the appendage basal cell ( Fig. 76D , an). Primary appendage unbranched. [Detailed descriptions: Majewski 1994b ; Santamaria 2003 ; De Kesel & Haelewaters 2014b ] Distribution and hosts Occurs on Dryops (Col. Dryopidae ). Widespread in Europe : Italy ( type ), United Kingdom ( Thaxter 1931 ), Poland ( Siemaszko & Siemaszko 1933 ), Finland , Russia ( Huldén 1983 ), Hungary ( Bánhegyi et al. 1985 ), Spain ( Santamaria 1992a ), Sweden ( Huggert 2010 ), and Belgium ( De Kesel & Haelewaters 2014b ). Collections examined from Denmark On Dryops anglicanus Edwards, 1909 (Col. Dryopidae ) DENMARK – Sydsjaelland (SZ) • Holmegårds Mose ; 55°17.685′ N , 11°47.928′ E ; PG73; 26 Apr. 2020 ; JP 1606 ; JP det.; ZMUC C-F-124361 . Fig. 76. Cantharomyces spp. A –B . C. elongatus Haelew. & De Kesel. A . Submature thallus with an undamaged appendage. B . Mature thallus. – C–F . C. italicus Speg. C –D . Typical thalli from the abdomen of the host, showing antheridium (an) and constriction of cell VI (arrow). E–F . Mature thalli from the pronotum of the host. In E, “*” points to cell VI corrugation. Scale bars: 50 µm. Photographs from slides ZMUC C-F-124174 (A), ZMUC C-F-124172 (B), ZMUC C-F-123549 (C–D), ZMUC C-F-124264 (E–F). On Dryops luridus (Erichson, 1847) (Col. Dryopidae ) DENMARK – Lolland, Falster, Møn (LFM) • Røgbølle Sø ved Sørup ; 54°42.497′ N , 11°34.760′ E ; PF66; 3 Sep. 2019 ; JP 1511 ; JP det.; ZMUC C-F-124263 , C-F-124264 , C-F-124265 . On Dryops similaris Bollow, 1936 (Col. Dryopidae ) DENMARK – Nordøstsjaelland (NEZ) • Amager Faelled ; 55°38.631′ N , 12°34.729′ E ; UB47; 15 Apr. 2018 ; JP 1035 ; JP det.; ZMUC C-F-123549 . Remarks First record from Denmark .This species often coexists with C. denigratus on the same host. Cantharomyces italicus was described on thalli from the upper surface of last abdominal tergites, and this seems to be its primary growing location, but heavily infected hosts may have thalli spreading to almost any part of the body. Thalli show rather interesting morphological differences depending on the host growth position, especially slenderer thalli growing on pronotum (on Dryops luridus , ZMUC C-F-124263, C-F-124264 and 124265) which have the cell VI with a corrugated and deeply brown pigmented lower dorsal surface ( Fig. 76E , *) similar to thalli drawn from Belgium by De Kesel et al. (2020 : fig. 4k), also collected from the pronotum. Further studies are needed to determine if these forms could be different species.