Pleurotus ostreatus fungus forms an edible mushroom that possesses important nutritional and medicinal
properties. Selenium (Se) is essential to human diets and it is in low concentration in the soil, and consequently
in food. P. ostreatus was grown in coffee husks enriched with various concentrations of sodium
selenite. The biological efficiency of P. ostreatus was affected by the addition of high concentrations of Se.
The highest level of Se absorption was obtained by adding 51 mg kg1 of sodium selenite. The mushrooms
from first flush contained more Se than the further flushes. These results demonstrate the great potential
of coffee husks in the production of Se-enriched mushrooms and show the ability of this fungus to absorb
and biomagnify Se.