Laboulbenia lecoareri (Balazuc) Huldén

MB#104411

Fig. 35D–E

Karstenia 25: 6 (Huldén 1985). – Basionym: Laboulbenia subterranea subsp. lecoareri Balazuc, Bulletin Mensuel de la Société Linnéenne de Lyon 43(8): 306 (Balazuc 1974e) [MB#352876]. –

Type: “Hôte: Trechoblemus micros (Herbst) (Col. Carab. Trechidae),… Une centaine d’exemplaires … proviennent d’une ancienne carrière souterraine de gypse voisine du carrefour du Tremble en fôret de l’Isle-Adam ( Val-d’Oise, commune de Nerville)”; PC. [France]

Diagnostic features

Cell V obtriangular, half or less of the length of cell IV, not connected with cell III. Outer appendage unbranched, very elongated, up to 500 µm long, consisting of many variably long cells, where the basal and suprabasal cells are distinctively narrow and paler than the ones above. Inner appendage absent. Insertion cell thick and separated from the perithecial wall. [Detailed description: Majewski 1994b]

Distribution and hosts

Typically infesting Trechoblemus micros (Col. Carabidae) (often as Trechus) but also mentioned on Thalassophilus longicornis (Sturm, 1825) (Balazuc 1990) from France, Germany, Hungary, Norway, Poland, United Kingdom (Santamaria et al. 1991), Belgium (De Kesel 1998), Ukraine (Majewski 2008) and Switzerland (Hoess & Senn-Irlet 2009).

Collections examined from Denmark

On Trechoblemus micros (Herbst, 1784) (Col. Carabidae) DENMARK – Lolland, Falster, Møn (LFM) • Gedser Strand; 54°33.588′ N, 11°58.187′ E; PF95; 27 Jun. 1903; Chr. Engelhart Dry 0054; Chr. Engelhart det.; ZMUC C-F-124120 . – Sydsjaelland (SZ) • Tryggevaelde Å ved Varpelev; 55°21.055′ N, 12°15.877′ E; UB23; 6 Jan. 2018; JP 968; JP det.; ZMUC C-F-123475 .

Remarks

First record from Denmark. A photo of this species is given here for the first time. This species could be suspected of being dioecious because of the presence of diminutive, likely male thalli paired with normal ones (Fig. 35D) and the absence of an inner appendage. Nevertheless, Balazuc’s drawings (1974e: fig. 51d–e) display a very minute basal cell of inner appendage, sometimes giving rise to a very thin branch weirdly divided into squarish cells; he also illustrated an accompanying diminutive thallus. Majewski (1994b) described an inner appendage but did not support it with figures. De Kesel et al. (2020) drew this inner appendage in one of their figures. Perhaps the inner appendage is caducous and disappears with maturation of thalli.