1, shape: the diameter of Pleurotus ostreatus cap is 5 to 12cm, which is hemispherical when it is young, and then gradually flattens, with rhombic, light brown, dark brown to dark cinnamon on the surface and dark scales in the middle. However, Pleurotus ostreatus is solitary or clustered, with fan-shaped, kidney-shaped, round, oblate hemispherical or flat-spread, with no concave base and light color.

2. Growth characteristics: Pleurotus ostreatus grows flat, without yellow shoots, and forms a mushroom skin after it is covered with inclined planes. The edge of the mushroom cover is round, and the mushroom skin is tight and hard. The growth characteristics of Pleurotus ostreatus are not obvious.