Verrucaria strasseri Servit , Stud. Bot. Cech . 9: 107, 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 strasseri Servit, Stud. Bot. Cech. 9: 107, 1948

Type.

[Italy], Auf Kalkconglommerat in Villa Lagarina bei Roveredo in Südtirol, 1.5.1883, P. Strasser (M-02039301!, holotype).

Description.

Prothallus not seen. Thallus whitish-grey, endolithic. Perithecia 0.15-0.38 mm, (3/4)-1-immersed, leaving deep pits in the rock. Involucrellum apical, ca. 50-90 mm thick, appressed to the exciple. Exciple ca. 0.22-0.26 mm in diam., wall pale brown to dark brown. Periphysoids ca. 30-50 × 1.5-2.5 mm, branching. Asci ca. 88-95 × 26-28 mm, 8-spored. Ascospores 0-septate, (23.6-)24.5-26.6-28.8(-30.2) × (10.1-)10.4-11.4-12.4(-13.7) mm (n = 17).

Notes.

The species may differ from the V. devergens and V. subtilis complexes by mostly fully immersed perithecia and from the V. subtilis complex by slightly larger perithecia and a thicker involucrellum.