Stigmatomyces constrictus Thaxt.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 253-255

Stigmatomyces constrictus Thaxt.

MB#189362

Fig. 56E–G

Proceedings of the American Academy of Arts and Sciences 36: 401 ( Thaxter 1901a). –

Type: “ On the legs and abdomen of a small fly. Ralum , New Pomerania. Berlin Museum, No. 1294 ”; FH. [ Papua New Guinea]

Stigmatomyces elachipterae Thaxt. ( Thaxter 1905: 323) [MB#191996]

Diagnostic features

Basal cell of appendage small, supporting a lower elongate cell bearing three antheridia, and two additional cells with two and three antheridia from bottom to top cell respectively. Perithecium with a venter distally producing four rounded prominences, and four more prominences on the transition between tiers w 2 and w 3. [Detailed description: Weir & Rossi 1995]

Distribution and hosts

Occurs on several genera of Diptera Chloropidae from the five continents: Papua New Guinea (type), Panama, Cameroon, Grenada, Jamaica, Trinidad & Tobago ( Thaxter 1917), USA ( Seymour 1967), Italy ( Rossi 1993), United Kingdom ( Weir & Rossi 1995), Bolivia ( Rossi 1998), Brazil ( Bergonzo et al. 2004), Uganda, Portugal, Sierra Leone, Taiwan, Germany, Yemen, Greece, Cuba ( Rossi et al. 2013), and Slovenia ( Rossi & Christian 2020).

Collections examined from Denmark

On Elachiptera brevipennis (Meigen, 1830) ( Diptera Chloropidae ) DENMARK – Sydsjaelland (SZ) • Østerskov ved Langebaek ; 54°59.421′ N, 12°6.435′ E; UA19; 19 Aug. 2019; JP 1497; JP det.; ZMUC C-F-124084 .

Remarks

First record from Denmark. Its presence in Denmark is not surprising according to the cosmopolitan distribution of the species. The surface of basal cell (I) appears characteristically striated ( Fig. 56E–G , arrows).

Figures

Fig. 56. Stigmatomyces spp. A–D. S. burdigalensis (Balazuc) A.Weir & W.Rossi. A–B. Mature thalli showing labelled cells I, II, III, VI, and basal cell of primary appendage (bc a). C. Primary appendage in detail from an immature thallus. D. Perithecial apex in detail showing slightly undulate margins and a conical tip. – E–G. S. constrictus Thaxt. Mature thalli. Surface of basal cell I appears characteristically striated (arrows in E and G). Scale bars: 50 µm. Photographs from slides ZMUC C-F-123707 (A–D), ZMUC C-F-124084 (E–G).