LICHALP

Verrucaria gudbrandsdalensis Zschacke ex H. Magn.

Lichenised.

Substrate: siliceous rocks, intermediate rocks (such as calciferous schists)

Altitudinal distribution: montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)

Note: a species with a mainly continuous, partly thicker and subrimose, whitish grey thallus, ascomata (to 0.3 mm in diam.) covered by a conspicuous involucrellum reaching far down at the flanks of the perithecium, ascospores to c. 25 µm long; on siliceous slate and similar calcium-poor substrates; widespread in Europe but rarely reported, with a few records from the Eastern Alps (Austria).