Corethromyces henrotii Balazuc ex Balazuc

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 220

Corethromyces henrotii Balazuc ex Balazuc

MB#283407

Fig. 47C–D

Bulletin Mensuel de la Société Linnéenne de Lyon 42 (10): 283 ( Balazuc 1973b, as henroti). –

Type: “ Sur Choleva oblonga Latreille ( Coleoptera, Leiodidae ) de Mouthier-Hautepierre (Doubs), H. Henrot leg.”; PC. [ France] [No. 74.34, Santamaria 2003]

Corethromyces henrotii Balazuc ( Balazuc 1971c: 252) (nom. inval.) [MB#541473]

Diagnostic features

Cell I small, with the dark pigmentation of the foot sometimes extending upwards. Appendage consisting of a rather large basal cell III bearing crowded fertile and sterile branches ( Fig. 47C ). Fertile branches slender, including intercalary antheridia. Cell VI inflated. Perithecium showing a shaded preapical region with a dark spot on the posterior side ( Fig. 47C , arrow). [Detailed descriptions: Santamaria 2003; De Kesel & Haelewaters 2019]

Distribution and hosts

Only on Choleva (Col. Leiodidae ) from Belgium, Czech Republic, Finland, France, Italy, Spain, and the Netherlands ( De Kesel & Haelewaters 2019).

Collections examined from Denmark

On Choleva agilis (Illiger, 1798) (Col. Leiodidae ) DENMARK – Nordøstsjaelland (NEZ) • Hillerød ; 55°55.714′ N, 12°18.383′ E; UC30; Oct. 1904; J.P. Johansen Dry0059; J.P. Johansen det.; ZMUC C-F-124125 .

On Choleva fagniezi Jeannel, 1922 (Col. Leiodidae ) DENMARK – Østjylland (EJ) • Skaerbro Kaer ; 56°4.588′ N, 9°46.314′ E; NH41; 24 Apr. 1998; V. Mahler DrY0060; V. Mahler det.; ZMUC C-F-124126 .

On Choleva jeanneli Britten, 1922 (Col. Leiodidae ) DENMARK – Lolland, Falster, Møn (LFM) • Lindeskov ved Nykøbing; 54°44.747′ N, 11°53.917′ E; PF87; 14 May 1994; JP DrY0061; JP det.; ZMUC C-F-124127 . – Nordvestsjaelland (NWZ) • Yderby Lyng ; 55°59.039′ N, 11°19.178′ E; PH40; 12 Apr. 2020; JP 1596; JP det.; ZMUC C-F-124356 .

On Choleva oblonga Latreille, 1807 (Col. Leiodidae ) DENMARK – Østjylland (EJ) • Klostermølle ; 56°2.432′ N, 9°41.629′ E; NH41; 12 Mar. 2017; JP 278; JP det.; ZMUC C-F-122757 .

Remarks

First record from Denmark. Some of the studied thalli belong to the unusual forms described by De Kesel & Haelewaters (2019), which are characterized by having a darkened cell III ( Fig. 47D ), a feature not considered enough important by those authors to separate them as a new species; our material is not in a good enough condition to be adequately studied, but the option of a new species should not be ruled out.

Figures

Fig. 47. Corethromyces spp. – A–B. C. bialowiezensis T.Majewski. Mature thalli, with labelled primary septum (a) and cell III. – C–D. C. henrotii Balazuc ex Balazuc. C. Typical mature thallus showing cell III and shaded preapical region with a dark spot on the perithecial posterior side (arrow). D. Mature thallus of a unusual form having a darkened cell III. – E–F. C. stilici Thaxt. Mature thalli from abdominal tergites (E) or sternites (F), both showing a labelled cell I blackened outgrowth (arrows). Scale bars: 50 µm. Photographs from slides ZMUC C-F-124370 (A–B), ZMUC C-F-124127 (C), ZMUC C-F-124125 (D), ZMUC C-F-122735 (E–F).