The document summarizes an experiment evaluating different paper and cardboard substrates for cultivating the white oyster mushroom Pleurotus florida. Ten materials were tested as substrates: eight types of paper (glaze paper, brown paper, newspaper, magazine paper, chart paper, kite paper, rough copy paper, and A-4 printing paper) and two types of cardboard (corrugated and plain cardboard). All substrates supported mushroom growth and fruiting. Yield and biological efficiency varied between substrates, ranging from 190-495 grams and 38-99% respectively over three flushes. Magazine paper and cardboard produced significantly higher yield and biological efficiency than the control (newspaper). Corrugated cardboard also produced significantly heavier individual mushrooms