Hattorioceros striatisporus(ハットリツノゴケ)はコケ植物の中では他に類を見ない独特の胞子の形態をしており,その特徴を重視して,この種のみを含む単系属Hattorioceros(ハットリツノゴケ属)が立てられた.これまで,ハットリツノゴケはタイプ標本の産地である西ヒマラヤのパンジャブ地方からしか知られていなかったが,今回,南太平洋のフィジーにも分布することを確認した.その結果,本種は西ヒマラヤとフィジーに奇妙な隔離分布をすることになった.このことの植物地理学的意味について,若干の考察を行った.

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The moss, Physcomitrella patens subsp. patens has been used as an excellent model to study molecular mechanisms of development regulated by plant hormones for the following reasons. (1) The same kinds of plant hormones found in higher plants, such as auxin and cytokinin, also have distinct effects on the moss development, (2) the developmental processes caused by the plant hormones can be easily observed at the cellular level, and (3) the techniques for genetics and molecular biology including the gene targeting technique are well established. In this review, we summarize previous physiological and molecular biological studies on plant hormones in P. patens, and introduce the gene tagging and gene/enhancer trap systems we recently established. Comparisons of developmental mechanisms between the moss and other plants will give evolutionary insights in the future.

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