called a 'phantom,' " he said.

In addition to the poor harvest, the government's ban on North Korean imports and reduced imports from China on safety concerns have driven up the price of homegrown matsutake, which now comprise less than 10 percent of total matsutake consumption in Japan.

"Because of high temperatures and a lack of rainfall between July and September, matsutake fungal threads failed to grow nationwide except for some parts of the country, like Iwate Prefecture," said Koji Iwase, professor at the Faculty of Agriculture, Tottori University.

"In addition to widespread death of pine forests in western Japan, the region's changing climate is responsible, which is starting to resemble a subtropical area because of global warming," Iwase said.

Japan's matsutake harvest peaked in 1953 at 6,484 tons, about 100 times that of last year's 65 tons.