Dichomyces nigrescens (Thaxt.) Scheloske ( Scheloske 1969: 106 ) Dichomyces inaequalis Thaxt. ( Thaxter 1894: 103 ) Laboulbeniomycetes (Fungi, Ascomycota) of Denmark Santamaria, Sergi Pedersen, Jan European Journal of Taxonomy 2021 2021-11-26 781 1 425 4FFXN Thaxt. [602,986,861,888] Laboulbeniomycetes Laboulbeniaceae Peyritschiella Fungi Laboulbeniales 285 286 Ascomycota species nigrescens  MB#181067  Fig. 67E–G    Proceedings of the American Academy of Arts and Sciences28 (10): 184 ( Thaxter 1893). –  Dichomyces nigrescens(Thaxt.) Scheloske ( Scheloske 1969: 106)[Not registered in MycoBank]. –     Type: “ On leg of  Philonthus debilisGrav., Massachusetts”; FH. [ USA]      Dichomyces inaequalisThaxt. ( Thaxter 1894: 103)[MB#243210]    Diagnostic features Thallus asymmetrical, small, up to 130 µm long. Lower tier of cells blackened, almost entirely opaque except for the central area. Middle tier of cells blackened outwards, extending with laterally superposed cells forming strips-like expansions as far as the upper part of the receptacle, right below the base of the perithecium. One perithecium for each thallus, on the upper tier, borne from one of the cells adnate to the axial cell in the center; auricles absent. [Detailed description: Thaxter 1896]    Distribution and hosts Reported from Europe( Finland, France, Germany, Italy, United Kingdom, Russia), America( USA), and Asia( Taiwan)( Santamaria et al.1991). Also in China( Shen & Ye 2006), and Thailand( Rossi & Bernardi 2018). Infects species of the genus  Philonthus(Col. Staphylinidae Staphylininae).    Collections examined from Denmark    On  Philonthus debilis(Gravenhorst, 1802)(Col. Staphylinidae Staphylininae) DENMARK–  Østjylland(EJ)• Kjellerup; 56°17.644′ N, 9°25.850′ E; NH23;  18 Nov. 2017;  JP820; JPdet.; ZMUC C-F-123314. –   Sydsjaelland(SZ)• Gammel Kalvehave; 54°59.745′ N, 12°8.232′ E; UA19;  27 Apr. 2018;  JP1085; JPdet.; ZMUC C-F-123603.    On  Philonthus discoideus(Gravenhorst, 1802)(Col. Staphylinidae Staphylininae) DENMARK–  Nordøstsjaelland(NEZ)• Vestfor Trørød; 55°50.223′ N, 12°31.185′ E; UB49;  13 Nov. 2016;  JP142; JPdet.; ZMUC C-F-122620.   Fig. 67.  Peyritschiellaspp. A –B.  P. furcifera(Thaxt.) I.I.Tav. Maturethalli. – C–D.  P. hybrida(Thaxt.) I.I.Tav. Maturethalli. – E–G.  P. nigrescensThaxt. Maturethalli. Scale bars: 50 µm. Photographs from slides ZMUC C-F-122619 (A), ZMUC C-F-123314 (B), ZMUC C-F-123464 (C–D), ZMUC C-F-123314 (E), ZMUC C-F-123603 (F–G).    On  Philonthus quisquiliarius(Gyllenhal, 1810)(Col. Staphylinidae Staphylininae) DENMARK–  Sydsjaelland(SZ)• Østerskovved Langebaek; 54°59.572′ N, 12°6.715′ E; UA19;  3 Jan. 2019;  JP1303; JPdet.; ZMUC C-F-123837.    Remarks First record from Denmark. This species should be compared with  P. furciferaby size but differs from that species by the off-centered solitary perithecium lacking apical auricles. 4988640556 On leg of Philonthus debilis Grav. FH United States of America Massachusetts 285 286 1 Massachusetts type 4988642203 On Philonthus debilis (Gravenhorst, 1802) 2017-11-18 ZMUC JP Denmark JP 56.294067 Kjellerup 1 9.430834 285 286 ZMUC C-F-123314 1 Ostjylland 4988641927 2018-04-27 ZMUC JP Denmark JP 54.99575 Gammel Kalvehave 1 12.1372 285 286 ZMUC C-F-123603 1 Sydsjaelland 4988641158 On Philonthus discoideus (Gravenhorst, 1802) 2016-11-13 ZMUC JP Denmark JP 55.83705 Trorod 1 12.51975 Vest 285 286 ZMUC C-F-122620 1 Nordostsjaelland 4988641573 On Philonthus quisquiliarius (Gyllenhal, 1810) 2019-01-03 ZMUC JP Denmark JP 54.992867 Langebaek 1 12.111917 Osterskov 287 288 ZMUC C-F-123837 1 Sydsjaelland