Verrucaria nylanderiana Servit, Stud. Bot. Cech . 9: 96, 1948

Type.

[France] Gallia, Sevres (M-0193237!, holotype).

Description.

Prothallus not seen. Thallus greenish-grey with green flecks, continuous, ca. 0.1-0.3 mm thick. Perithecia 0.12-0.32 mm, immersed, leaving deep pits in the rock; ca. 80-100 perithecia/cm2. Involucrellum absent. Exciple ca. 0.27-0.41 mm in diam., higher than broad, often pear-shaped, wall dark brown. Periphysoids ca. 40-60 × 2-2.5 mm, branched-anastomosing. Asci 85-106 × 25-29 mm, 8-spored. Ascospores 0-septate, 18-23 × 12-14 mm.

Notes.

The species differs from V. viridula by shorter spores and absence of an involucrellum.