Verrucaria clauzadei de Lesd., Bull. Bot. Soc. France 97: 171, 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 clauzadei de Lesd., Bull. Bot. Soc. France 97: 171, 1950

Type.

[France] Calcaire argileux enposé au N, á 100 m au NE du pas du Bourreau Allaunch, 7.7.1951, Clauzade (PRM-858628!, syntype?).

Description.

Prothallus not seen (but, according to the protologue, "linea nigra marginatus"). Thallus grey with tiny brown flecks, thinly epilithic, continuous. Perithecia 0.25-0.45 mm, 3/4-1-immersed, leaving deep pits in the rock; ca. 70-80 perithecia/cm2. Involucrellum covering half of the exciple, ca. 60-80 mm thick. Exciple ca. 0.25 mm in diam., wall black. Periphysoids ca. 35-50 × 2-2.5 mm. Ascospores 0-septate, 28-34(-38) × 12-13 mm.

Notes.

The studied specimen is tiny and better material is needed to solve the identity of the species. The specimen matches in most respects with V. subjunctiva . The spores seen were narrower, but the spore size given in the protologue ( Bouly de Lesdain 1950) 25-33 × 13-16 mm is similar to V. subjunctiva .