LICHALP

Verrucaria olivascens Servít

Lichenised. Poorly known taxon.

Substrate: calciferous rocks

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

Note: a calcicolous species with a thin, spreading, whitish to greyish, minutely granulose to warty-farinose thallus, hemispherically protruding ascomata (to 0.5 mm in diam.) which are externally covered by a very thin, farinose thalline layer, an adpressed involucrellum reaching down to the base of the perithecium, and oblong to obovoid ascospores (to 35 µm long); rarely reported in Central Europe, including the Eastern Alps (Austria).