Abstract
A histochemical study on the distribution of sterin in the fruit body of Pleurotus ostreatus (FR.) QUÉL was made and the following, results were obtained.
1. The fruit body of Pleurotus ostreatus is composed of stipe and pileus. The stipe consists of an outer veil and inner tissue. The pileus includes outer veil, inner tissue and lamellae.
2. In the young fruit body, sterin is found mostly at the lower part of the stipe, and less in its upper part. In comparison with this, very little sterin is found in the lamellae and outer veil of the pileus. As the fruit body grows, however, the sterin content in the stipe gradually increases and diminishes in the lower part of the inner tissues. In the pileus, the greatest content is found in the pith, and less in lamellae and outer veil.
3. In the mature fruit body, sterin content of the stipe is greater in the upper part of the pith than in its middle part. In the pileus, sterin is contained more abundantly in the outer veil, lamellae and inner tissue.
