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.