Table 2.

Tolerance index levels of Pleurotus sp. in various heavy metals concentrations.

Heavy metals	Concentrations
	15	30	45	60
Cobalt	0.45	0.4	0.32	0
Copper	0.39	0.31	0	0
Nickel	0	0	0	0

Tolerance index rating values indicate: 0.00–0.39—very low metal tolerance. 0.40–0.59—low metal tolerance. 0.60–0.79—moderate metal tolerance. 0.80–0.99—high metal tolerance. 1.00–> 1.00—very high metal tolerance.