Stigmatomyces platensis Speg.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 266-267

Stigmatomyces platensis Speg.

MB#188602

Fig. 60F–H

Anales del Museo Nacional de Historia Natural de Buenos Aires 29: 676 ( Spegazzini 1917). –

Type: “ Sobre la superficie inferior de las alas y sobre el dorso del abdomen de una pequeña mosca, Limosina , en La Plata, Febr. y May. 1916 ”; LPS. [ Argentina]

StigmatomYces affinis Thaxt. ( Thaxter 1918a: 732) [MB#160021]

Diagnostic features

Basal cell of appendage flattened, darker, supporting a series of 5–6 ± flattened, oblique, outwardly bulging cells, each bearing pairs of rather elongated antheridia on the inner side. Perithecium with an oval venter, with distal knobs and a well-distinguished, gradually tapering neck, which terminates in a distinct, asymmetrical tip showing two protuberant lips. Cell VII protruding below the perithecium ( Fig. 60F–H , arrows) because the septum which separates this cell from cell n′ is noticeably constricted. [Detailed descriptions: Majewski 1994b; De Kesel & Hanssens 2007]

Distribution and hosts

Known in Europe from Poland ( Majewski 1990a), Belgium ( De Kesel & Hanssens 2007), Czech Republic, Italy ( Rossi et al. 2010), and Portugal ( Rossi et al. 2013); in America from Argentina (type); in Africa from Cameroon ( Thaxter 1931); and in Asia from Indonesia ( Thaxter 1931). Described on Limosina , reported also on “borborid flies”, and on Pullimosina ( Diptera Sphaeroceridae ). Now, the name S. platensis should be exclusively retained for species living on flies of the genus Pullimosina ( Rossi et al. 2010) . The fungus recorded by De Kesel & Hanssens (2007) on Paralimosina Papp, 1973 from Belgium may belong to a different species ( Rossi et al. 2010).

Collections examined from Denmark

On Pullimosina vulgesta Rohácek, 2001 ( Diptera ; Sphaeroceridae ) DENMARK – Østjylland (EJ) • Tange å vest for Kjellerup ; 56°17.959′ N, 9°23.462′ E; NH23; 17 Feb. 2018; JP 1189; W. Gritsch det.; ZMUC C-F-123713 .

Remarks

First record from Denmark. This species is particularly similar to S. divergatus from which it differs by minor characteristics, such as the protruding cell VII and its preference for flies of the genus Pullimosina .

Figures

Fig. 60. Stigmatomyces spp. A. S. limosinae Thaxt. Mature thallus. – B–E. S. majewskii H.L.Dainat, Manier & Balazuc. B–C. Mature thalli. D. Primary appendage in detail with labelled spinous process from the original spore apex (sx). E. Perithecial tip in detail. – F–H. S. platensis Speg. Mature thalli showing protrusion of cell VII (arrows). Scale bars: A–C, E–H = 50 µm; D = 25 µm. Photographs from slides ZMUC C-F-123718 (A), ZMUC C-F-123705 (B, D–E), ZMUC C-F-123731 (C), ZMUC C-F- 123713 (F–H).