Stigmatomyces entomophilus (Peck) Thaxt.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 258-260

Stigmatomyces entomophilus (Peck) Thaxt.

MB#180765

Fig. 58A–C

Proceedings of the American Academy of Arts and Sciences 25: 8 ( Thaxter 1890). – Basionym: Appendicularia entomophila Peck , Report of the botanist. Annual Report on the New York State Museum of Natural History 38: 96 ( Peck 1885) [MB#431382]. – Appendiculina entomophila (Peck) Berlese ( Berlese 1889: 96) [MB#178031]. – Peckifungus entomophilus (Peck) Kuntze ( Kuntze 1891: 864) [MB#431921]. –

Type: “ On various parts of the body of Drosophila nigricornis Loew (Drosophilidae); Nyack , New York, USA, 19 Mar. 1884 (J.L. Zabriskie), in coll. FH (Syntypes 5942–5948)”; FH. [According to Weir & Rossi 1995: 844]

Stigmatomyces drosophilae Thaxt. ( Thaxter 1931: 133) [MB#263532]

Diagnostic features

Basal cell of appendage small, distally darker, supporting a series of five cells, the lower flattened and dark, each of the five cells bearing paired antheridia on their outer side, except the upper cell which gives rise to three antheridia, the distal of which is spinose ( Fig. 58C , sx). Perithecium with an oval venter tinged with brown, and a well-distinguished, very elongated neck which tapers distally to a distinct, asymmetrical tip, showing two protruding lips. [Detailed descriptions: Thaxter 1896; Weir & Rossi 1995]

Distribution and hosts

On species of Drosophila in the subgenus Drosophila like Drosophila nigricornis Sturtevant, 1921 , D. funebris and D. confusa Staeger, 1844 ( Diptera Drosophilidae ). Described from USA, it has been also found in Austria ( Gercke 1886), France ( Picard 1913), United Kingdom ( Blair 1947), Bolivia ( Rossi 1998), Czech Republic ( Rossi & Máca 2006), and the Netherlands ( Haelewaters et al. 2018b).

Collections examined from Denmark

On Drosophila funebris (Fabricius, 1787) ( Diptera Drosophilidae ) DENMARK – Nordøstsjaelland (NEZ) • Fredensborg ; 55°58.535′ N, 12°24.317′ E; UC30; ca 1870; Staeger Dry0007; det. unknown; ZMUC C-F-124020 .

Remarks

First record from Denmark. Records from Gabon and South Africa ( Santamaria et al. 1991) require confirmation according to Weir & Rossi (1995). Records on Drosophila subgenus Sophophora as Drosophila obscura and D. subobscura Collin, 1936 correspond to S. majewskii . Stigmatomyces entomophilus and S. majewskii differ by the number of cells forming the axis of the appendage (including the basal cell), six in the former and five in the latter, and also because S. entomophilus is distinctly more elongate than S. majewskii .

Figures

Fig. 58. Stigmatomyces spp. A–C. S. entomophilus (Peck) Thaxt. A–B. Mature thalli. C. Primary appendage in detail showing spinous process from the original spore apex (sx). – D–F. S. ephydrae L.Mercier & R.Poiss. D. Primary appendage in detail showing spinous process from the original spore apex (sx). E–F. Mature thalli. Scale bars: 50 µm. Photographs from slides ZMUC C-F-124020 (A–C), ZMUC C-F-124262 (D–F).