Cucumbers are thick.

1. Size difference: The diameter of king oyster mushroom is usually about 5-10 cm, and the thickness is thin. The diameter of cucumbers is usually about 2-5 cm and the length can reach 10-20 cm.

2. Appearance: Pleurotus eryngii is a kind of fungus. Its shape is similar to a flat abalone, with a smooth surface and white or light yellow color. Cucumber is a vegetable that has an elongated shape and is usually light green or yellow-green in color.