LICHALP

Acolium sessile (Pers.) Arnold

Syn.: Cyphelium sessile (Pers.) Trevis., Calicium sessile Pers.

Lichenised.

Substrate:

Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)

Note: a species with a grey thallus forming insular patches on the thalli of epiphytic Pertusaria-species (mainly P. coccodes), found on very old oaks; also known from North America, it is most common in Western Europe; records from the Alps have a fairly different ecology, and therefore need confirmation.