Verrucaria oligocarpa Servit , Stud. Bot. Cech . 9: 97, 1948

Pykaelae, Juha, Kantelinen, Annina & Myllys, Leena, 2020, Taxonomy of Verrucaria species characterised by large spores, perithecia leaving pits in the rock and a pale thin thallus in Finland, MycoKeys 72, pp. 43-92 : 43

Verrucaria oligocarpa Servit, Stud. Bot. Cech. 9: 97, 1948

Type.

[Germany] Eichstätt, ober dem Tiefenthale, 2. 1887, Boll (M-0204594!, holotype).

Description.

Prothallus not seen. Thallus grey, endolithic. Perithecia 0.08-0.21 mm, immersed, leaving deep pits in the rock; ca. 60-100 perithecia/cm2. Involucrellum absent. Exciple ca. 0.19-0.24 mm in diam., wall medium brown to dark brown, apex often thickened. Periphysoids ca. 15-30 × 2-2.5 mm. Asci ca. 61-69 × 20-21 mm, 8-spored. Ascospores 0-septate, 18-23 × 8-11 mm.

Notes.

The species may differ from V. caesiopsila by narrower spores and shorter periphysoids. Verrucaria koerberi has an apical involucrellum and narrower spores.