Verrucaria hercegensis Servit , Stud. Bot. Cech . 9: 85, 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 hercegensis Servit, Stud. Bot. Cech. 9: 85, 1948

Type.

[Montenegro] Dalmatia mer., Herceg Novi, 80 m, 1929, M. Servít (PRM-760604!, holotype).

Description.

Prothallus not seen. Thallus white to grey, endolithic. Perithecia 0.12-0.26 mm, immersed, leaving deep pits in the rock; ca. 30-40 perithecia/cm2. Involucrellum absent. Exciple ca. 0.4 mm in diam., wall black. Periphysoids ca. 35-50 × 1.5-2 mm, branched-anastomosing. Ascospores 0-septate (only few seen), 20-23 × 10-11 mm.

Notes.

The spore size given in the protologue ( Servít 1948) is 21-25(-32) × 12-13(-15) mm. The species differs from V. devergens and V. foveolata in smaller spores. Verrucaria devergens has smaller exciple (up to 0.35 mm). Verrucaria caesiopsila may differ in a smaller exciple and possibly in smaller spores.