This refers to a colony of moss that grows near the water surface on the shore or in the water of a lake or pond, and is scraped away by the movement of the water and waves, and as it rotates on the bottom of the water, it takes on a shape similar to the algae marimo. Mosses that form this include Gemium nigricans, Gemium nigricans, and Gemium platyphyllum. The most famous ones are those found in Lake Kussharo and Lake Akan in Hokkaido. The Gemium platyphyllum marigokei of Lake Inawashiro in Fukushima Prefecture has been designated a natural monument, but is now almost extinct. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
岸辺の水面近くまたは湖沼の水中に繁茂したコケ類の群叢が水や波の運動によって削り取られ,水底で回転するうちに藻類のマリモと相似状になったものをさす。これを形成するコケ類としてはヤナギゴケ,イナワシロツボミゴケ,ヒロハノススキゴケなどが知られている。北海道の屈斜路湖,阿寒湖のものが有名である。また福島県猪苗代湖のヒロハノススキゴケのマリゴケは天然記念物に指定されたが,現在はほとんど絶滅状態である。
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