Verrucaria slovaca Servit , Stud. Bot. Cech . 11: 125, 1950

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 slovaca Servit, Stud. Bot. Cech. 11: 125, 1950

Type.

Slovakia, Liptovskě hole, Zuberec, Osobita, 1650-1680 m, 1935, Suza (PRM-765231!, syntype).

Description.

Prothallus not seen. Thallus white or grey, endolithic. Perithecia 0.25-0.35 mm, 1/2-3/4(-1)-immersed, leaving shallow to deep pits in the rock. Involucrellum reaching the exciple base, ca. 70-90 mm thick, appressed to the exciple or slightly diverging from the exciple. Exciple ca. 0.15-0.25 mm in diam., wall pale. Periphysoids ca. 25 × 2-2.5 mm. Ascospores 0-septate, few spores 1-septate, ca. 20-27 × 9-10 mm, not well developed.

Notes.

Verrucaria slovaca may possibly belong to the V. subtilis complex, but similar specimens have not been found in Finland. The spore size given by Servít (1950) is 24-30 × 9-11 mm. Breuss (2016) apparently found better-developed spores than in this study: (22-)24-27(-28) × (7.5-)9-11-(12) mm.