Peyritschiella nigrescens Thaxt.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 286-288

Peyritschiella nigrescens Thaxt.

MB#181067

Fig. 67E–G

Proceedings of the American Academy of Arts and Sciences 28 (10): 184 ( Thaxter 1893). – Dichomyces nigrescens (Thaxt.) Scheloske ( Scheloske 1969: 106) [Not registered in MycoBank]. –

Type: “ On leg of Philonthus debilis Grav. , Massachusetts ”; FH. [ USA]

Dichomyces inaequalis Thaxt. ( 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; JP 820; JP det.; ZMUC C-F-123314 . – Sydsjaelland (SZ) • Gammel Kalvehave ; 54°59.745′ N, 12°8.232′ E; UA19; 27 Apr. 2018; JP 1085; JP det.; ZMUC C-F-123603 .

On Philonthus discoideus (Gravenhorst, 1802) (Col. Staphylinidae Staphylininae ) DENMARK – Nordøstsjaelland (NEZ) • Vest for Trørød ; 55°50.223′ N, 12°31.185′ E; UB49; 13 Nov. 2016; JP 142; JP det.; ZMUC C-F-122620 .

On Philonthus quisquiliarius (Gyllenhal, 1810) (Col. Staphylinidae Staphylininae ) DENMARK – Sydsjaelland (SZ) • Østerskov ved Langebaek ; 54°59.572′ N, 12°6.715′ E; UA19; 3 Jan. 2019; JP 1303; JP det.; ZMUC C-F-123837 .

Remarks

First record from Denmark. This species should be compared with P. furcifera by size but differs from that species by the off-centered solitary perithecium lacking apical auricles.

Figures

Fig. 67. Peyritschiella spp. A–B. P. furcifera (Thaxt.) I.I.Tav. Mature thalli. – C–D. P. hybrida (Thaxt.) I.I.Tav. Mature thalli. – E–G. P. nigrescens Thaxt. Mature thalli. 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).