TOKYO - Excessive levels of radioactive cesium were detected in mushrooms locally grown in Japan's Yamanashi prefecture, a government report showed on Tuesday.

According to the report, the test was conducted on Oct 15 and the mushroom was not circulated in the market

The sample of Cortinarius caperatus, a type of edible mushroom, in the prefecture's Narusawa village, reported a cesium level of 150 becquerels per kilogram (Bq/kg), said the report published by the Ministry of Health, Labor and Welfare on its official website.

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The allowed cesium level on general food products stands at 100 Bq/kg in the country.

According to the report, the test was conducted on Oct 15 and the mushroom was not circulated in the market.

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The ministry regularly publishes test results of radioactive substances in foods conducted by a total of 14 prefectural governments in north and east Japan following the accident at the crippled Fukushima No. 1 nuclear power plant.