Stigmatomyces geomyzae W.Rossi & Cesari

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 261

Stigmatomyces geomyzae W.Rossi & Cesari

MB#113381

Fig. 59A–F

Giornale Botanico Italiano 113 (5–6): 384 ( Rossi & Cesari Rossi 1980). –

Type: “Sullo scutello e tra le zampe di un esemplare di Geomyza tripunctata Fall. (Opomyzidae) catturato in località Colli del Forno, nel comune di Montelibretti (Roma). Holotypus in herbario Instituti Botanici apud Universitatem Studiorum Romae, n. 933 ”; RO.

Diagnostic features

Basal cell of appendage darkened ( Fig. 59E , bc a), supporting a series of five ± isodiametric cells, each bearing solitary antheridia on the inner side, except the upper cell which gives rise to two antheridia, the distal of which is spinose ( Fig. 59E , sx). Perithecium with an oval venter, and a well-distinguished, short neck which tapers distally to an asymmetrical tip, showing four lips arranged as: one protuberant in the back, two identical on the sides, and one short in the front ( Fig. 59C–D ). Perithecial outer wall cells arranged spirally and forming conspicuous ridges on the venter ( Fig. 59F ). [Detailed description: Weir & Rossi 1995]

Distribution and hosts

Reported from Italy (type), Spain ( Santamaria & Rossi 1993), United Kingdom ( Weir & Rossi 1995), and Portugal ( Rossi et al. 2013). Specific on species of Geomyza ( Diptera Opomyzidae ).

Collections examined from Denmark

On Geomyza balachowskyi Mesnil, 1934 ( Diptera Opomyzidae ) DENMARK – Nordøstjylland (NEJ) • Nordmarken, Laesø ; 57°18.919′ N, 11°4.819′ E; PJ25; 11 Jul. 1969; Zool. Mus. Exp. Dry 0011; J.W.A. v. Zuijlen det.; ZMUC C-F-124024 .

On Geomyza tripunctata Fallén, 1823 ( Diptera Opomyzidae ) DENMARK – Lolland, Falster, Møn (LFM) • Møns Klint, Syd ; 54°56.985′ N, 12°32.270′ E; UA49; 19 Aug. 2019; JP 1494; V. Michelsen det.; ZMUC C-F-124080 . – Nordøstjylland (NEJ) • Nordmarken, Laesø ; 57°18.919′ N, 11°4.819′ E; PJ25; 15 Jul. 1969; Zool. Mus. Exp. Dry 0010; J.W.A. v. Zuijlen det.; ZMUC C-F-124023 . – Nordøstsjaelland (NEZ) • Pinseskoven ; 55°35.839′ N, 12°33.250′ E; UB46; 6–20 May 2017; W. Gritsch 1179; W. Gritsch det.; ZMUC C-F-123703 .

Remarks

First record from Denmark. It is probably a much more common species than the absence of records seems to indicate.

Figures

Fig. 59. Stigmatomyces spp. A–F. S. geomyzae W.Rossi & Cesari. A–B. Mature thalli. C–D. Perithecial tip in detail. E. Primary appendage in detail with labelled spinous process from the original spore apex (sx) and appendage basal cell (bc a). F. Perithecial outer wall cells in detail, arranged spirally and forming conspicuous ridges. – G–J. S. hydrelliae Thaxt. G–H. Mature thalli. I–J. Perithecium and appendage in detail at two different focus levels, showing spinous process from the original spore apex (sx) and pointed projection on the perithecial apex. Scale bars: A–D, F–J = 50 µm; E = 25 µm. Photographs from slides ZMUC C-F-123703 (A, C–F), ZMUC C-F-124024 (B), ZMUC C-F-123721 (G), ZMUC C-F-124032 (H–J).