Ge-Xian-Mi (an edible species of Nostoc) grows in some mountain paddy fields in China during winter and forms macroscopically visible subspherical colonies. The geology and climate at one of its locations, Hefeng County, were investigated, and the present-day situation of Ge-Xian-Mi was assessed in order to raise awareness that it may be endangered. There were formerly 796 ha of rice fields suited to its growth in Hefeng County and the maximum annual yield ever reached was 25 t. The annual mean temperature is about 12.2degreesC, and the annual rainfall is 1934 mm with mean relative humidity of...
