LICHALP

Placynthium tantaleum (Hepp) Hue

Syn.: Biatora corallinoides (Schaer.) Hepp var. tantalea Hepp, Placynthium diblastum Gyeln., Placynthium nigrum (Huds.) Gray var. tantaleum (Hepp) Arnold, Racoblenna tantalea (Hepp) Trevis.

Lichenised.

Substrate: calciferous rocks, siliceous rocks, ,

Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) to the alpine belt (potential vegetation: treeless Alpine grasslands and tundras, to the lower limit of perennial snow and the equilibrium line of glaciers)

Note: on basic siliceous rocks along mountain streams. Often considered as a synonym of P. nigrum, this species differs in the smooth areolae, the constantly 2-celled ascospores, and the ecology (hydro- and orophilous).