朝日新聞は8月23日，自由研究で始めたフジマリモの培養を50年間続けている会社員の方を紹介しています。フジマリモは山中湖などに生育する淡水藻で，絶滅危惧種です。県の天然記念物に指定される前から培養を始め，株を50年間継代培養しているとのことです。
http://www.asahi.com/science/update/0823/TKY201108230272.html
On August 23, Asahi-Shinbun (Newspaper) reported that a businessman who is living in Tokyo has cultured a freshwater alga, Aegagropila linnaei var. yamanakaensis, in his housing more than 50 years. This species is recorded as an endangered species by Japanese Government. He started its culture when he was elementary school student as the independent research during the summer vacation (summer project). Researcher evaluated his special technique that could achieve more than 50 years.