A moss in the family Erigeronaceae (illustration). It is distributed separately between North America and East Asia, but the populations in both regions are distinguished by subspecies. The East Asian subspecies is widely distributed from Siberia to Indonesia, but in Japan it is particularly common in volcanic regions. It grows in colonies on rock walls in shady places, forming large, glossy mats. The stems are 1 to 3 cm long and bear numerous leaves in two regular rows. The leaves are lanceolate, with the central vein biased toward the back, and the abdomen is divided into two parts that tightly embrace the stem. This makes the leaves resemble shrimp shells. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
エビゴケ科の蘚類(イラスト)。北アメリカと東アジアに隔離分布するが,両地域の個体群は亜種で区別されている。東アジア産の亜種はシベリアからインドネシアにかけて広く分布するが,日本ではとくに火山地域に多い。陰湿な場所の岩壁に群生し,つやのある大きなマットをつくる。茎は長さ1~3cmで,多数の葉を規則正しく2列につける。葉は披針形で,中央脈が背部に偏在し,腹部は2片に分かれて茎を強く抱く。このため,葉はエビの甲殻に似ている。
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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