LICHALP

Leptogium rivulare (Ach.) Mont.

Syn.: Leptogium crenatellum Tuck., Leptogium sernanderi Du Rietz, Lichen rivularis Ach.

Lichenised.

Substrate: siliceous rocks, bark

Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)

Note: a species resembling a small L. cyanescens, but lacking isidia, with a blue-grey thallus usually bearing laminal apothecia; on rocks or roots of deciduous trees along rivers; a rare holarctic species, with a few records from the Western Alps (France).