Laboulbenia philonthi Thaxt.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 195

Laboulbenia philonthi Thaxt.

MB#147868

Fig. 41A–B

Proceedings of the American Academy of Arts and Sciences 28: 174 ( Thaxter 1893). –

Type: “ USA, Massachusetts, Belmont/Waltham, Waverley neighborhood, “ April 23, 1813 ” [sic], no collector, on Philonthus sp. , slide FH 00313494 (5 adult thalli)”; FH. [lectotype designated in Haelewaters et al. 2015b: 468]

Diagnostic features

Often, cell I bears a blackish lateral swelling above the foot ( Fig. 41A–B , arrows). Cell V oval, as long as cell IV, connected with septum III–IV. Outer appendage simple or branched, with the lower 2–3 cells short, inflated, and separated with thick blackened septa. Inner appendage profusely branched unilaterally above the basal cell, with branches similar to those of the outer appendage. Basal cells of inner and outer appendages similar. [Detailed descriptions: Thaxter 1896; Majewski 1994b; Santamaria 1998]

Distribution and hosts

Infects Col. Staphylinidae of the genus Philonthus and relatives (e.g., Spatulonthus , Paragabrius Coiffait, 1963 , Oligotergus Bierig, 1937 ) from Europe: Spain, United Kingdom, France, the Netherlands, Italy, Germany, Austria, Czech Republic, Poland, Lithuania, Latvia, Greece; America: USA, Mexico, Guatemala, Uruguay, Argentina; Asia: Turkey and Korea ( Majewski 2008). Recently recorded also from Ecuador ( Proaño Castro & Rossi 2008), Trinidad & Tobago, Venezuela, Panama, Grenada, Canada ( Haelewaters et al. 2015b), Bulgaria, Hungary ( Rossi et al. 2019a), Slovakia ( Rossi et al. 2019b), Slovenia ( Rossi & Christian 2020), and Belgium ( De Kesel et al. 2020).

Collections examined from Denmark

On Philonthus salinus Kiesenwetter, 1844 (Col. Staphylinidae Staphylininae ) DENMARK – Nordvestsjaelland (NWZ) • Flasken nord for Reersø ; 55°31.965′ N, 11°9.831′ E; PG35; 26 Jan. 2014; JP 605; JP det.; ZMUC C-F-123094 . – Sydsjaelland (SZ) • Østerskov ved Langebaek ; 54°59.572′ N, 12°6.715′ E; UA19; 3 Jan. 2019; JP 1301; JP det.; ZMUC C-F-123835 .

Remarks

First record from Denmark. Because of its presence in the surrounding countries, the finding of L. philonthi in Denmark is far from surprising. The bulging of cell I is not found in all the thalli reported in the literature; so far we lack explanations of what factors favour its presence.

Figures

Fig. 41.Laboulbenia spp. A–B. L. philonthi Thaxt. Mature thalli showing blackish lateral swelling above the foot (arrows). – C–D. L. picardii Maire. C. Immature thallus. D. Corrugation of cell II margins in detail. – E–G. L. pseudomasei Thaxt. E, G. Mature thalli. F. Branch (arrow) from cell V in detail. Scale bars: A–C, E–G = 50 µm; D = 25 µm. Photographs from slides ZMUC C-F-123094 (A–B), ZMUC C-F- 123456 (C–D), ZMUC C-F-122782 (E), ZMUC C-F-122742 (F), ZMUC C-F-122740 (G).