Stereocaulon tornense (H. Magn.) P. James & Purvis
Syn.: Bilimbia tornensis H. Magn.
Lichenised.
Substrate: siliceous rocks, acidic soil (mostly on siliceous substrata)
Altitudinal distribution: subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: a species with a crustose thallus, and therefore difficult to recognise as a Stereocaulon, resembling S. leucophaeopsis, but areoles smaller, ascospores shorter (to 30 µm long), and secondary chemistry with atranorin and stictic acid; on acidic pebbles in humid situations; widespread in Europe but rare in the study area, being known only from the Eastern Alps (Austria).
