Verrucaria serlosensis Servit , Stud. Bot. Cech . 9: 106, 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 serlosensis Servit, Stud. Bot. Cech. 9: 106, 1948

Type.

[Austria], Kalksteine des Serlosgipfels 8200' Matrei-Tirol, 7. 1869, Arnold (M-0193173!, holotype).

Description.

Prothallus not seen. Thallus grey to pale brown, endolithic, somewhat inconspicuous. Perithecia 0.12-0.22 mm, immersed, leaving deep pits in the rock; ca. 60-100 perithecia/cm2. Involucrellum absent. Exciple ca. 0.2 mm in diam., wall pale to pale brown, apex dark, thickened. Ascospores 0-septate, (23.2-)23.9-24.7-25.4(-25.5) × (12.7-)12.8-13.7-14.6(-15.1) mm (n = 15).

Notes.

The specimen is rather poor. The species differs from V. foveolata by a pale exciple wall, shorter spores and perhaps by a smaller exciple. Verrucaria caesiopsila has smaller spores and a dark exciple wall.