LICHALP

Spilonema revertens Nyl.

Syn.: Asirosiphon densatulum Nyl., Ephebe kerneri Zukal

Lichenised.

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

Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) 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: a species with thalli forming dense, blackish cushions which are several mm across and to c. 5 mm thick, composed of erect filaments, basally with blue-green rhizohyphae, and Stigonema-photobionts; on damp siliceous rocks along streams, near waterfalls or along seepage tracks; widespread in the Holarctic region, generally not common, but perhaps undercollected and more widespread in the Alps.