LICHALP

Bacidia trachona (Ach.) Lettau

Syn.: Biatora trachona (Ach.) Körb., Bilimbia trachona (Ach.) Trevis., Verrucaria trachona Ach.

Lichenised.

Substrate: siliceous rocks

Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)

Note: the true B. trachona does not belong to Bacidia and has a more or less suboceanic distribution in Europe, from Portugal to Scandinavia. Several records from the Alps are dubious and could refer to B. coprodes.