Cantharomyces denigratus Thaxt. MB#262988 Fig. 75F–G Memoirs of the American Academy of Arts and Sciences 16: 27 (Thaxter 1931). – Type: [Not designated] [Ind. loc.] “On Parnus griseus and P. luridus, New Forest, Hampshire, England; kindly communicated by Mr. F. Muir”; FH. [United Kingdom] Diagnostic features Thallus stocky. Cell II almost entirely blackened except for a small area below cells III and VI; this blackening spreads towards the dorsal margin of cell III. Cells I and II separated by a constricted septum; forming a geniculate stalk. Cell VI strongly constricted at the middle (Fig. 75F, arrow). Antheridium occupying the side of the appendage basal cell (Fig. 75F, an). Primary appendage unbranched. [Detailed descriptions: Majewski 1994b; Santamaria 2003; De Kesel & Haelewaters 2014b] Distribution and hosts On Dryops (Col. Dryopidae) from United Kingdom (type), Poland (Siemaszko & Siemaszko 1933), 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-124362. On Dryops auriculatus (Geoffroy, 1785) (Col. Dryopidae) DENMARK – Sydjylland (SJ) • Lakolk; 55°8.325′ N, 8°29.618′ E; MG62; 31 May 2013; JP 107; JP det.; ZMUC C-F-122584. 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-124266. 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-123548 • Asserbo Plantage; 56°1.984′ N, 12°0.817′ E; UC11; 28 Apr. 2019; JP 1454; JP det.; ZMUC C-F-124004. Remarks First record from Denmark. Cantharomyces denigratus and C. italicus cannot be considered growth forms of the same species because there are no correlations with host sex and growing location.

Published as part of Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, pp. 1-425 in European Journal of Taxonomy 781 on page 313, DOI: 10.5852/ejt.2021.781.1583, http://zenodo.org/record/5828924