M. brittanicus Laboulbeniomycetes (Fungi, Ascomycota) of Denmark Santamaria, Sergi Pedersen, Jan European Journal of Taxonomy 2021 2021-11-26 781 1 425 447RN Thaxt. [589,999,1264,1291] Laboulbeniomycetes Laboulbeniaceae Monoicomyces Fungi Laboulbeniales 332 333 Ascomycota species britannicus  MB#192361  Figs 82, 83A    Proceedings of the American Academy of Arts and Sciences35: 413 ( Thaxter 1900, as  M. brittanicus). –     Type: “ On  Homalota insectaThorn., British Museum, No. 454, Hammer smith, England. On superior surface of abdomen”; FH.    Diagnostic features Primary appendage usually branched once above the basal cell, rarely simple, with the dorsal branch deeply blackish-brown near the base. Cell III inflated, large, pale, in contact with cell I and separated from cell II by a ± vertical or oblique septum ( Fig. 82C–D). Two to four secondary appendages for each antheridium. Each antheridium including four phialides ( Fig. 82E–F, arrows). [Detailed descriptions: Thaxter 1908; Santamaria 1989]    Distribution and hosts Reported on  Atheta(in part as  HomalotaMannerheim, 1831) from Europe: Finland, France, Germany, Italy, Poland, Spain, United Kingdom, Russia( Santamaria et al.1991), Hungary( Bánhegyi et al.1985), Belgium( De Kesel & Haghebaert 1991), Greece( Castaldo et al.2004), Latvia( De Kesel & Krastina De Kesel 2006), Sweden( Huggert 2010), and the Netherlands(Haelewaters et al.2014).    Collections examined from Denmark    On  Acrotona aterrima(Gravenhorst, 1802)(Col. Staphylinidae Aleocharinae) DENMARK–  Nordøstjylland(NEJ)• Vandplaskenved Kaersgård Strand; 57°31.199′ N, 9°53.070′ E; NJ57;  21 Nov. 2017;  JP806; JPdet.; ZMUC C-F-123301.    On  Acrotona fungi(Gravenhorst, 1806)(Col. Staphylinidae Aleocharinae) DENMARK–  Nordvestsjaelland(NWZ)• Flyndersø ved Dybesø; 55°58.151′ N, 11°45.621′ E; PH60;  4 Nov. 2017;  JP723; JPdet.; ZMUC C-F-123216.    On  Acrotona pseudotenera(Cameron, 1933)(Col. Staphylinidae Aleocharinae) DENMARK–  Østjylland(EJ)• Kjellerup; 56°17.644′ N, 9°25.850′ E; NH23;  16 Feb. 2018;  JP975; JPdet.; ZMUC C-F-123482. –   Lolland, Falster, Møn(LFM)• Hobyskov; 54°44.069′ N, 11°15.296′ E; PF46;  7 Jan. 2018;  JP956; JPdet.; ZMUC C-F-123462. –   Nordvestjylland(NWJ)• Legind; 56°45.832′ N, 8°48.782′ E; MH89;  19 Oct. 2008;  JP80; JPdet.; ZMUC C-F-122555. –   Sydsjaelland(SZ)• Gammel Kalvehave; 54°59.745′ N, 12°8.232′ E; UA19;  27 Apr. 2018;  JP1087; JPdet.; ZMUC C-F-123605.    On  Acrotonasp.(Col. Staphylinidae Aleocharinae) DENMARK–  Nordøstsjaelland(NEZ)• Brønshøj; 55°42.234′ N, 12°30.135′ E; UB47;  2 Jul. 2012;  JP38; JPdet.; ZMUC C-F-122513.    On  Aloconota sulcifrons(Stephens, 1832)(Col. Staphylinidae Aleocharinae) DENMARK–  Østjylland(EJ)• Klostermølle; 56°2.432′ N, 9°41.629′ E; NH41;  14 Feb. 2019;  JP1349; JPdet.; ZMUC C-F-123888.    On Atheta longicornis (Gravenhorst, 1802)(Col. Staphylinidae Aleocharinae) DENMARK–  Nordvestsjaelland(NWZ)• Klintebjerg ved Klint; 55°57.351′ N, 11°34.463′ E; PH60;  1 May 2016;  JP56; JPdet.; ZMUC C-F-122531. –   Sydsjaelland(SZ)• Gammel Kalvehave; 54°59.745′ N, 12°8.232′ E; UA19;  24 Mar. 2018;  JP1012; JPdet.; ZMUC C-F-123519.    On  Atheta volans(Scriba, 1859)(Col. Staphylinidae Aleocharinae) DENMARK–  Sydsjaelland(SZ)• Tryggevaelde Å ved Varpelev; 55°21.055′ N, 12°15.877′ E; UB23;  6 Jan. 2018;  JP973; JPdet.; ZMUC C-F-123480.    Remarks First record from Denmark. Very often, cell II is difficult to distinguish because it is flat and wedgeshaped. In front view it appears almost concealed behind cell I and below cell III ( Fig. 82D). In side view, the disposition of cells I, II and III is a characteristic that easily distinguishes  M. britannicusfrom  M. homalotae( Fig. 82C–D).  Thaxter (1908), when describing  M. britannicus, wrote “too nearly related to  M. homalotae, and may prove to be only a variety” and “general structure as in  M. homalotae, the third cell of the primary appendage suffused with blackish brown, somewhat constricted below”. Likely, Thaxter refers to the third cell of the receptacle or to the basal cell of the appendage. Distinctiveness of  M. britannicusfrom  M. homalotaewas questioned by Majewski (1994b)who considered the differences between the two species irrelevant and included  M. britannicusamong the synonyms of  M. homalotaedescribing the latter with very broad characteristics. The first author (SS) has studied the typesof both species several years ago; in 1990 the typeslide of  M. britannicus(labelled FH2352) was borrowed from FH ( Fig. 83A). The typeslide contained only one thallus, as illustrated by Thaxter (1908). Although the photographs of the typesare old and of low quality, we reproduce them here for its documentary interest ( Fig. 83A–B). An extended discussion appears below under the remarks of  M. homalotae. 4988641378 On Homalota insecta Thorn. FH United Kingdom England 332 333 1 type 4988641699 On Acrotona aterrima (Gravenhorst, 1802) 2017-11-21 NEJ JP Denmark JP 57.519985 Kaersgard Strand 1 9.8845 Vandplasken 333 334 ZMUC C-F-123301 1 Nordostjylland 4988641657 On Acrotona fungi (Gravenhorst, 1806) 2017-11-04 ZMUC JP Denmark JP 55.969185 Flynderso ved Dybeso 1 11.76035 333 334 ZMUC C-F-123216 1 Nordvestsjaelland 4988640926 On Acrotona pseudotenera (Cameron, 1933) 2018-02-16 ZMUC JP Denmark JP 56.294067 Kjellerup 1 9.430834 333 334 ZMUC C-F-123482 1 Ostjylland 4988641241 2018-01-07 ZMUC JP Denmark JP 54.73448 Hobyskov 1 11.254933 333 334 ZMUC C-F-123462 1 Lolland, Falster, Mon 4988641687 2008-10-19 ZMUC JP Denmark JP 56.763866 Legind 1 8.813033 333 334 ZMUC C-F-122555 1 Nordvestjylland 4988640651 2018-04-27 ZMUC JP Denmark JP 54.99575 Gammel Kalvehave 1 12.1372 333 334 ZMUC C-F-123605 1 Sydsjaelland 4988642265 On Acrotona sp. 2012-07-02 ZMUC JP Denmark JP 55.7039 Bronshoj 1 12.50225 333 334 ZMUC C-F-122513 1 Nordostsjaelland 4988640393 On Aloconota sulcifrons (Stephens, 1832) 2019-02-14 ZMUC JP Denmark JP 56.040535 Klostermolle 1 9.693817 333 334 ZMUC C-F-123888 1 Ostjylland 4988640734 On Atheta longicornis (Gravenhorst, 1802) 2016-05-01 ZMUC JP Denmark JP 55.95585 Klintebjerg ved Klint 1 11.574384 333 334 ZMUC C-F-122531 1 Nordvestsjaelland 4988640889 2018-03-24 ZMUC JP Denmark JP 54.99575 Gammel Kalvehave 1 12.1372 333 334 ZMUC C-F-123519 1 Sydsjaelland 4988641166 On Atheta volans (Scriba, 1859) 2018-01-06 ZMUC JP Denmark JP 55.350918 Tryggevaelde A ved Varpelev 1 12.264617 333 334 ZMUC C-F-123480 1 Sydsjaelland