Rhachomyces lasiophorus (Thaxt.) Thaxt.

MB#186325

Fig. 17E–F

Proceedings of the American Academy of Arts and Sciences 30: 468 (Thaxter 1895). – Basionym: Acanthomyces lasiophora Thaxt., Proceedings of the American Academy of Arts and Sciences 29: 37 (Thaxter 1892) [MB#431393]. –

Type: “ On Atranus pubescens, Connecticut ”; FH. [USA]

Diagnostic features

Main receptacle axis not continuing into a lateral branch above the perithecium. Appendages types “a” and “b” inseparable, very abundant, deeply darkened. Perithecium broadly oval, very inflated, up to 60 µm in width, showing a ± conspicuous preapical darkened ring. [Detailed descriptions: Thaxter 1896; Majewski 1994b; De Kesel 2002]

Distribution and hosts

On species of Col. Carabidae belonging to the genera Acupalpus, Agonum (?) Bonelli, 1810, Anthracus Motschulsky, 1850, Atranus LeConte, 1848, Badister, and Dromius Bonelli, 1810 . Known from Europe (France, Belgium, United Kingdom, Italy, Germany and Poland), USA and Korea (Majewski 2008). Also from the Netherlands (Haelewaters & De Kesel 2010), Czech Republic (Rossi et al. 2010), Turkey (Rossi 2016), Bulgaria (Rossi et al. 2019a), and Hungary (Rossi & Christian 2020).

Collections examined from Denmark

On Acupalpus dubius Schilsky, 1888 (Col. Carabidae)

DENMARK – Sydjylland (SJ) • Lakolk; 55°8.325′ N, 8°29.618′ E; MG61; 21 May 2017; JP 422; JP det.; ZMUC C-F-122906 .

On Acupalpus exiguus Dejean, 1829 (Col. Carabidae)

DENMARK – Nordøstsjaelland (NEZ) • Stampeskov ved Rådvad; 55°48.332′ N, 12°33.138′ E; UB48; 28 Feb. 2017; H. Liljehult 359; JP det.; ZMUC C-F-122841 • Syd for Løjesø i Rude Skov; 55°49.866′ N, 12°28.551′ E; UB49; 12 Apr. 2018; JP 1030; JP det.; ZMUC C-F-123542 . – Sydsjaelland (SZ) • Østerskov ved Langebaek; 54°59.572′ N, 12°6.715′ E; UA19; 3 Jan. 2019; JP 1281; JP det.; ZMUC C-F-123813 .

On Acupalpus flavicollis (Sturm, 1825) (Col. Carabidae)

DENMARK – Nordøstsjaelland (NEZ) • Dyrehaven; 55°47.347′ N, 12°33.957′ E; UB48; 20 Apr. 2017; H. Liljehult 275; JP det.; ZMUC C-F-122754 • Syd for Løjesø i Rude Skov; 55°49.866′ N, 12°28.551′ E; UB49; 12 Apr. 2018; JP 1028; JP det.; ZMUC C-F-123540 .

On Anthracus consputus (Duftschmid, 1812) (Col. Carabidae)

DENMARK – Bornholm (B) • Skelsmyre i Rønne Plantage; 55°4.375′ N, 14 45.096′ E; VB80; 25 Apr. 2014; JP 509; JP det.; ZMUC C-F-122992 . – Lolland, Falster, Møn (LFM) • Gedesby; 54°35.290′ N, 11°58.199′ E; 6–14 Jun. 2013; E. Vesterhede 188; JP det.; ZMUC C-F-122667 .

Remarks

First record from Denmark. Balazuc (1971a) described R. lasiophorus subsp. demauxii on Acupalpus exiguus from France, differing from typical forms by the reduced thalli, with few cells on the receptacle. We have found this form on tarsi of several studied hosts (Fig. 17F) and it may be considered a growth form of the nominal subspecies.