...There are many species, and about 10 species grow along the coast of Japan alone. The body shape varies depending on the species, and there are U. pertusa Kjellm. (illustration) which has a wide, leaf-like body with many small holes, U. reticulata Fors. which has large holes and a mesh-like body, U. arasakii Chihara which has few or almost no holes and a bamboo leaf-like overall shape, and U. conglobata Kjellm. whose body overlaps like the petals of a double-flowered flower. Reproduction is mostly from spring to summer, and there are two types of reproduction: sexual reproduction by male and female gametes with two flagella, and asexual reproduction by zoospores with four flagella. ... *Some of the terminology explanations that mention "Amiaosa" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…種類が多く,日本の沿岸だけでも約10種が生育する。体形は種類によって異なり,幅の広い葉状の体に多数の小穴があいたアナアオサU.pertusa Kjellm.(イラスト),穴が大きく生長して体が網目構造を呈するアミアオサU.reticulata Fors.,穴は少ないかまたはほとんどなく,全形がササの葉の形を呈するナガアオサU.arasakii Chihara,体が八重咲きの花弁のように重なり合うボタンアオサU.conglobata Kjellm.などがある。生殖は春から夏にかけてが多く,2本の鞭毛をもつ雌雄の配偶子による有性生殖と,4本の鞭毛をもつ遊走子による無性生殖とがある。… ※「アミアオサ」について言及している用語解説の一部を掲載しています。 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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