Monoicomyces nigrescens Thaxt.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 352-354

Monoicomyces nigrescens Thaxt.

MB#189290

Fig. 89F–G

Proceedings of the American Academy of Arts and Sciences 38: 10 ( Thaxter 1902). –

Type: “ U.S.A.: On Calodera sp. , Intervale , N.H., Jul. 1909, R. Thaxter 1359 ( FH–2452 , type) (according to Santamaria 1996c)”; FH.

Diagnostic features

Cell III entirely darkened ( Fig. 89F ). Primary appendage unbranched, short, consisting of up to four cells. Antheridia dark towards the base and margin, bearing two secondary appendages. Each antheridium including four phialides. Stalk cell of perithecium narrowed and darkened near the base. [Detailed descriptions: Thaxter 1908; Majewski 1994b; Santamaria 1996c]

Distribution and hosts

Reported on many genera and species of Aleocharinae (Col. Staphylinidae ) like Atheta and Tachyusa , but also on others. Recorded from Europe: the Netherlands, Germany, Italy, Poland, Spain, United Kingdom, Portugal ( Majewski 2008), Sweden ( Huggert 2010), Czech Republic ( Rossi et al. 2010), and Belgium ( De Kesel et al. 2020); America: USA (type), Argentina ( Spegazzini 1912), and Uruguay ( Spegazzini 1917); and Asia: Japan ( Majewski 1988). The record from Sri Lanka ( Thaxter 1931) was described as a separate species by Santamaria (1996c) ( M. ceylonensis ).

Collections examined from Denmark

On Dilacra luteipes (Erichson, 1837) (Col. Staphylinidae Aleocharinae ) DENMARK – Nordøstsjaelland (NEZ) • Ledreborg ; 55°36.740′ N, 11°58.456′ E; PG86; 21 Apr. 1885; leg. unknown Dry0150; det. unknown; ZMUC C-F-124217 .

Remarks

First record from Denmark. Danish thalli were immature but identifiable and in agreement with the key by Santamaria (1996c).

Figures

Fig. 89. Monoicomyces spp. A–C. M. matthiatis T.Majewski. A. Mature thallus. B. Lower receptacle (I, II, and III) and antheridium (tiers of cells labelled with t1–3) in detail. C. Central area of a thallus in detail showing cell III, the primary septum (a), and the darkened, oblique septum separating the basal inflated cell from the elongated apical cell of the primary appendage (arrow). – D–E. M. myllaenae Santam. D. Mature thallus from Spanish type slide kept in BCB. E. Broken and damaged thallus from Denmark. – F–G. M. nigrescens Thaxt. F. Primary appendage in detail showing cell III at the base. G. Immature thallus. Scale bars: A, D–E, G = 50 µm; B–C = 20 µm; F = 25 µm. Photographs from slides ZMUC C-F-123613 (A–C), BCB-SS2329c (D) (holotype), ZMUC C-F-124215 (E), ZMUC C-F-124217 (F–G).