LICHALP

Verrucaria glaucodes Nyl.

Lichenised.

Substrate: calciferous rocks

Altitudinal distribution: submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus)

Note: a calcicolous species resembling V. pinguicula, but with a thin, rimose to subareolate, whitish-greenish thallus with a bluish tinge, semi-immersed ascomata (to c. 0.2 mm in diam.) with hardly pigmented perithecial wall, an adpressed involucrellum reaching down about half the perithecium, and ellipsoid ascospores (to c. 15 µm long); most frequent in the western part of continental Europe, including the Western Alps (France).