Leaf moss - bryophyte

Japanese: 葉上苔 - ようじょうごけ（英語表記）bryophyte

A general term for mosses that grow on living leaves of ferns and evergreen trees. Some foliar mosses are known to have rhizoids that penetrate the leaf tissue and absorb water and nutrients, but generally they are simply attached to the leaf surface and there is no nutritional connection between the two. They develop in warm and humid regions and have differentiated into many different species in the tropics, but are also quite common in lowland valleys in southern Japan. There are few mosses or hornworts among foliar mosses, and most are liverworts, especially in the genera Cololejeunea and Leptolejeunea of the Cerataceae family and the genus Radula of the Cerataceae family.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

シダや常緑樹などの生葉上に生育するコケの総称。一部の葉上苔で，仮根が葉の組織内に入り水や養分を吸収することが知られているが，一般には単に葉の表面に付着しているもので両者の間に栄養的なつながりはない。温暖で湿潤な地域に発達し，熱帯では多種に分化しているが，日本の南部でも低地の谷間などにかなり多い。葉上苔には蘚（せん）類やツノゴケ類は少なく，大部分が苔（たい）類で，特にクサリゴケ科のヒメクサリゴケ属Cololejeunea，カビゴケ属Leptolejeunea，ケビラゴケ科のケビラゴケ属Radulaなどに多い。

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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