Rhachomyces canariensis Thaxt.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 85-86

Rhachomyces canariensis Thaxt.

MB#189311

Fig. 17A–B

Proceedings of the American Academy of Arts and Sciences 35: 436 ( Thaxter 1900). –

Type: “ On Trechus flavomarginatus Woll. , British Museum., No. 419. Teneriffe . On elytra”; FH. [Canary Islands]

Rhachomyces bolivarii Gonz. Fragoso ( González Fragoso 1924: 405) [MB#189408]

Rhachomyces reymondii Lepesme ( Lepesme 1942: 66, as reymondi) [MB#290453]

Rhachomyces vayssierei Lepesme ( Lepesme 1942: 65) (sensu Balazuc 1971e: 114) [MB#290455]

Diagnostic features

Main receptacle axis consisting of 6–23 cells. Appendages of type “a” and “b” very similar, consisting of 3–5 brownish cells. Those of type “b” mostly abundant, surrounding ± the base of the perithecium. Appendages of type “c” consisting of a solitary flask-shaped, somewhat falcate antheridium, above a darkened supporting cell, which is separated from cells of the tertiary receptacle by a dark and constricted septum ( Fig. 17A , *). Perithecium rather stout; septa between wall cells slightly prominent. [Detailed descriptions: Thaxter 1908; Santamaria 1989; Majewski 1994b; De Kesel 2002]

Distribution and hosts

Occurs on species of the genus Trechus and Epaphius Leach, 1819 (Col. Carabidae ), including caveinhabiting and surface species.According to Santamaria et al. (1991) appears to be widespread in Europe ( Austria, Bulgaria, France, Germany, Hungary, Italy, Poland, Portugal, Spain, Sweden, Russia), Canary Islands, Madeira, Morocco and Turkey. Also from Bosnia-Herzegovina ( Balazuc 1971d). Reported later from Belgium ( De Kesel & Rammeloo 1992), United Kingdom ( Weir 1994), Czech Republic ( Rossi & Máca 2006), Denmark ( Høier 2009), Switzerland ( Hoess & Senn-Irlet 2009), and the Netherlands ( Haelewaters & De Kesel 2020).

Collections examined from Denmark

On Epaphius secalis (Paykull, 1790) (Col. Carabidae )

DENMARK – Nordøstjylland (NEJ) • Bønderskoven i Tofte Skov ; 56°49.955′ N, 10°14.981′ E; NH79; 8–22 Aug. 2013; I. Aggerholm 941; JP det.; ZMUC C-F-123444 • Engskoven i Tofte Skov ; 56°51.525′ N, 10°15.065′ E; NJ70; 8–22 Aug. 2013; I. Aggerholm 937; JP det.; ZMUC C-F-123438 .

On Trechus obtusus Erichson, 1837 (Col. Carabidae )

DENMARK – Fyn (F) • Gyldenstens inddaemmede Strand ; 55°34.447′ N, 10°7.211′ E; NG75; 2 Apr. 2014; JP 703; JP det.; ZMUC C-F-123192 • Knudshoved Marina ; 55°17.781′ N, 10°50.542′ E; PG12; 18 Oct. 2017; JP 587; JP det.; ZMUC C-F-123073 . – Lolland, Falster, Møn (LFM) • Naesby Strand ; 54°44.625′ N, 11°4.539′ E; PF36; 23 Feb. 2014; JP 550; JP det.; ZMUC C-F-123036 • Rødbyhavn ; 54°39.569′ N, 11°21.958′ E; PF55; 7 May 2017; JP 398; JP det.; ZMUC C-F-122881 . – Nordøstjylland (NEJ) • Bønderskoven i Tofte Skov ; 56°49.955′ N, 10°14.981′ E; NH79; 8–22 Aug. 2013; I. Aggerholm 927; JP det.; ZMUC C-F-123426 , C-F-123442 • Engskoven i Tofte Skov ; 56°51.525′ N, 10°15.065′ E; NJ70; 8–22 Aug. 2013; I. Aggerholm 936; JP det.; ZMUC C-F-123436 • Havgranerne i Tofte Skov ; 56°50.576′ N, 10°15.552′ E; NJ70; 5–19 Sep. 2013; I. Aggerholm 925; JP det.; ZMUC C-F-123423 • Knarmod i Tofte Skov ; 56°51.824′ N, 10°15.470′ E; NJ70; 22 Aug.–5 Sep. 2013; I. Aggerholm 948; JP det.; ZMUC C-F-123453 • Toftgården i Tofte Skov ; 56°50.789′ N, 10°12.918′ E; NJ70; 22 Aug.–5 Sep. 2013; I. Aggerholm 945; JP det.; ZMUC C-F-123449 . – Nordøstsjaelland (NEZ) • Kagsmose ; 55°42.698′ N, 12°27.378′ E; UB47; 19 Sep. 2013; H. Liljehult 1397; JP det.; ZMUC C-F-123940 . – Nordvestsjaelland (NWZ) • Bognaes Skov på Tuse Naes ; 55°44.966′ N, 11°45.817′ E; PG78; 10 Dec. 2013; JP 879; JP det.; ZMUC C-F-123377 • Maglesø Plantage ; 55°38.136′ N, 11°41.186′ E; PG66; 18 Feb. 2017; JP 286; JP det.; ZMUC C-F-122765 .

On Trechus quadristriatus (Schrank, 1781) (Col. Carabidae )

DENMARK – Nordøstsjaelland (NEZ) • Vest for Trørød ; 55°50.223′ N, 12°31.185′ E; UB50; 13 Nov. 2016; JP 139; JP det.; ZMUC C-F-122616 .

Remarks

There are no important differences between thalli found on surface beetles (type specimens) and those collected on cave beetles (described as R. bolivarii , R. reymondii and R. vayssierei ). The species is very common in Denmark.

Figures

Fig. 17. Rhachomyces spp. A–B. R. canariensis Thaxt. Mature thalli from Trechus obtusus (A) and Epaphius secalis(B). Appendages type “c” are labelled in A (*). – C–D. R. furcatus (Thaxt.) Thaxt. Mature thalli with appendages of type “c” labelled in D (*). – E–F. R. lasiophorus (Thaxt.) Thaxt. Mature thalli. F. Short form from tarsi. Scale bars: 50 µm. Photographs from slides ZMUC C-F-122765 (A), ZMUC C-F-123438 (B), ZMUC C-F-122521 (C–D), ZMUC C-F-122906 (E–F).