The biological value of 5 mushrooms Chlorophyllum molybditis, Psathyrella atroumbonata, Termitomyces robustus, Termitomyces striatus and Volvariella esculenta from our collection of wild edible mushrooms were determined using weanling rats. C. molybditis supported rapid growth with PER (2.63) higher than the casein control (2.50). P. atroumbonata was average in biological performance (PER 1.50) while T. robustus and V. esculenta did not support growth at all. Rats on T. striatus dried at 60 degrees C for 48 h lost weight rapidly and showed pathological signs of toxicity by the second day. All rats on this diet died by the fourth day of the experiment. When the diet of T. striatus dried at 90 degrees C for about 8 h was fed, the rats gained weight marginally but all survived. Prolonged storage of T. striatus at 60 degrees C for 5-8 weeks also seemed to detoxify the poisonous component such that PER and NPR values were 0.8 and 2.0 respectively. 2 pairs each of adult rats fed C. molybditis and Tricholoma lobayensis diets for 10 days were mated. Rats of C. molybditis diet gave 5 and 6 litters each and only one of these litters seemed to have retarded growth. Rats on T. lobayensis diet did not produce any litters for 14 weeks but the female produced off-spring when mated with control male rats.