Czerwona lista porostów zagrożonych w Puszczy Pilickiej [Red List of threatened lichens in the Pilicka Old-growth Forest]
The first regional list of threatened lichens and allied fungi is presented. The list is a result of investigation studies in the Pilicka Old-growth Forest, forests located on both sides of the middle course of the Pilica River, which flows in Central Poland. The status of threat to the lichen and lichenicolous fungus species listed has been determined according to the Red List Categories by IUCN (2001, version 3.1). The data obtained were compared with historical ones. Changes of the species main frequency were used as an additional indicator of threat status. The Red List includes 140 taxa of lichens and lichenicolous fungus, which constitute 51.8% of the local biota and 8.7% of Polish biota. The status of threatened biota has the following categories: Regionally Extinct (RE) - 12 taxa, Critically Endangered (CR) - 18, Endangered (EN) - 28, Vulnerable (VU) - 42, Near Threatened (NT) - 23, Least Concern (LC) - 7 and Data Deficient (DD) - 10.