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Summary This text analyses short story – Pleśń świata – written by Bolesław Prus in the context of nature writing. According to the nature writing the most important questions raised by writers are: what is nature? How can we define it? What is the connection between nature and human? Prus in Pleśń świata presents a small ecosystem; the protagonist of the story is a scientist who observes a big stone near Sybilla’s Temple in Puławy. He describes the nature’s world through biocentrism. He rejects antropocentrism. This piece of nature observed by the protagonist symbolises a microcosmos. Prus promotes ecological awareness among readers. People are connected with animals, plants, minerals so they should respect the law of nature. What is more, people need nature which is a source of inspiration.