Southern slope of Mt. Olszak (453 m) in the Opawskie Mts. (Eastern Sudety Mts., SW Poland) is planned to be protected as an entomological-and-phytocenotic reserve. The main objectives of the protection are acidophilous oak forest and maple-linden slope forest being habitats of many rare species of moths and lacewings known from not numerous localities in Poland. Out of them, the populations of two unique in native lepidopteran fauna, saproxylic and phytosaprophagous species: Alabonia staintoniella (ZELL.) and Zanclognatha zelleralis (WCK.), are preserved here at their northernmost locality in Europe.
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