Hitoegusa (single-petaled grass) - Hitoegusa (English spelling) green laver

Japanese: ヒトエグサ(一重草) - ヒトエグサ（英語表記）green laver

A membranous green alga with a body made of a single layer of cells, this seaweed of the family Monochaetaceae is widely distributed in warm seas south of the Kanto region (illustration). It grows on rocks in the upper intertidal zone from winter to spring, and its body grows large and forms large colonies, especially in calm areas such as inland bays. Its body shape is almost circular, and it can reach 4 to 10 cm or more in size, and as it grows, it develops wrinkles and cracks. A similar species, M. latissimum (Kütz.) Wittr., is distributed along the central Japanese coast and in the Seto Inland Sea, and has a thin, larger body that is often perforated.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

1層の細胞から体ができている膜状の緑藻で，関東以南の暖海域に広く分布するヒトエグサ科の海藻（イラスト）。冬から春に潮間帯上部の岩上に生育し，とくに内湾などの波の静かなところでは体は大きくなり，大きい群落をつくる。体形はほぼ円形で，大きさは4～10cm，またはそれ以上になり，生長するにつれて，しわや裂け目ができる。似た種類のヒロハノヒトエグサM.latissimum (Kütz.) Wittr.は日本中部沿岸や瀬戸内海などに分布し，体は薄くて，より大型となり，また穴があくことが多い。

出典　株式会社平凡社世界大百科事典第２版について　情報

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