Schematic drawings of sections of perithecia of the study species A involucrellum apical B involucrellum covering half of the exciple C involucrellum reaching the exciple base level D involucrellum enveloping the exciple.

  Part of: Pykälä J, Kantelinen A, Myllys L (2020) Taxonomy of Verrucaria species characterised by large spores, perithecia leaving pits in the rock and a pale thin thallus in Finland. MycoKeys 72: 43-92.