A genus of very specialized small ferns in the family Lycopodium, found in New Zealand and Australia. The base of the body is a tuberous tuber, from which emerges a stalk with clusters of rod-shaped leaves. When mature, the stalk elongates and bears a sporangium at the end. Branches extend downward from the stalk, and new tubers are produced at the end. This specialized structure allows the plant to adapt to areas with a clear difference between the rainy and dry seasons. [Kato Masahiro] Source: Heibonsha World Encyclopedia, 2nd Edition Information |
非常に特殊化した小型のシダ植物ヒカゲノカズラ科の1属で,ニュージーランドとオーストラリアに産する。体の基部は塊状のいもで,それから茎が出て,茎に棒状の葉が房状につく。成熟すると茎が伸長し先端に胞子囊穂をつける。茎からは枝が下方にのび,先に新しいいもがつくられる。このような特殊な構造で,雨季・乾季の差のはっきりした所に適応している。【加藤 雅啓】
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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