There exists a large array of this strain of mushrooms, and the vastness of king Oyster depends on the various growing conditions available. To add to that, outdoor-grown King Oyster has many variations from ones grown indoors. Larger, darker caps, meat-like texture, and few or no stemming are the signifying features of outdoor-grown King Oyster. In contrast, the stems of indoor cultivated King Oyster mushrooms are greatly fat and their caps seem to be all pale in color.