棕黑色平菇是在人防地道栽培的平菇中偶然发现的。我们栽培的平菇是美味侧耳(Pleurotus sapidus Schulz),1981年夏天,发现有一丛长得特别黝黑茁壮,不仅其菌盖变为棕黑色,而且菌褶也由白色变成灰棕色,菌柄极短或无菌柄,孢子印为淡紫色。通过组织分离获得斜面纯菌种,然后进行突变株平菇的瓶栽试验。培养基配方为:78％棉子皮,20％麸皮,1％石膏粉,0.5％尿素,0.5％硫酸镁。料水比为l∶1.6。经30 Brown-black mushrooms are accidentally discovered in flat-grown mushrooms of civil air defense. Pleurotus sapidus Schulz, the Pleurotus sapidus Schulz cultivated in our country, was found in the summer of 1981. It was found that in the summer of 1981, a cluster of plants that grew very dark and dark was not only black-brown, but also the folds of the bacteria turned from white to beige. Short or sterile handle, spores printed lilac. Obtained by tissue separation bevel pure strains, and then the mutant strains of mushrooms bottle test. Medium recipe: 78% cotton seed, 20% bran, 1% gypsum powder, 0.5% urea, 0.5% magnesium sulfate. Feed water ratio of l: 1.6. After 30