Pediastrum (medal algae) - Pediastrum (English spelling)

Japanese: クンショウモ(勲章藻) - クンショウモ(英語表記)Pediastrum
Pediastrum (medal algae) - Pediastrum (English spelling)
A freshwater algae belonging to the family Polytrichum, order Chlorococcales. Many species are known, but all of them live as plankton in lakes, marshes, and ponds. A colony is made up of 4 to 64, and occasionally 128, cells gathered in a flat shape. The diameter of the cells is at most 20 μm, and the colony is also a very small algae with a diameter of no more than 200 μm. Each cell is concave on one side, and the surrounding cells often have projections. When individual cells divide, the colony dissolves and each becomes a new colony. The name "Polytrichum" comes from the shape of the colony.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
緑藻類クロロコックム目アミミドロ科に属する淡水藻。多数の種が知られているが,いずれも湖沼,湿原,池などでプランクトンとして生活している。4~64まれには 128の細胞が平板状に集って群体をつくっている。細胞の径は大きくても 20μmほどで,群体も径がせいぜい 200μmの微小な藻類である。個々の細胞は一方がへこんだ形で,周辺のものはしばしば突起をもっている。個々の個体が分裂すると群体は解かれておのおのが新群体となる。クンショウモの名は群体の形による。

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