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Effect of different cultivation substrates on the mycelial growth rate (A), primordia formation (B), and BE (C) of Ganoderma sinense; treatment A (99% sawdust, 0% wheat bran, 1% calcium carbonate), treatment B (98% sawdust, 1% wheat bran, 1% calcium carbonate), and treatment C (96% sawdust, 3% wheat bran, 1% calcium carbonate); different letters denote statistically significant differences at P < 0.05
