Verrucaria integrella (Nyl.) Nyl., Lich. Pyrenaeorum Orient. Obs. Nov.: 21, 1891

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 integrella (Nyl.) Nyl., Lich. Pyrenaeorum Orient. Obs. Nov.: 21, 1891

Verrucaria integra (Nyl.) Nyl. f. integrella Nyl, Flora 64: 457, 1881. Basionym.

Type.

[Switzerland] ad dolomit supra Poschiavo, Anzi (H-NYL 3384!, syntype).

Description.

Prothallus absent. Thallus inconspicuous, endolithic. Perithecia 0.18-0.23 mm, 3/4-1-immersed, leaving deep pits in the rock; ca. 100-110 perithecia/cm2. Ostiole depressed, ca. 20-50 mm wide. Involucrellum absent (?). Exciple ca. 0.2 mm in diam., wall dark. Ascospores 0-septate, ca. 17-21 × 11-12 mm.

Notes.

The studied specimen may be a tiny syntype. Nylander has annotated to the specimen: spores 18-24 × 11-14 mm. Verrucaria integrella may be synonymous with V. caesiopsila as often stated in literature (e.g. Clauzade and Roux 1985; Santesson et al. 2004).