Resumen de Caloplaca ruderum, a lichen species new to Poland

Miroslawa Ceynowa Gieldon, Edyta Adamska

• Caloplaca ruderum (Malbr.) Laundon, a lichen species not reported from Poland so far, was collected in Toruñ city and environs (Lower Vistula region).

  The taxon occupies old walls of two medieval castles.