Psilophytes

…When vascular plants are divided into four lineages based mainly on the characteristics of their leaves, the group of plants that do not differentiate into leaves or roots are called naked-stem plants (psilophytes), also known as psilophytes. Extant species are classified into two genera, psilophytes and psilophytes, which are treated as independent families, but no fossils are known, and they are considered to have no direct phylogenetic relationship with the archaic psilophytes that became extinct in the Devonian period. …

*Some of the terminology that mentions "psilophytes" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…維管束植物を主として葉の性質で四つの系統に区分した場合，葉も根も分化しない植物群を裸茎植物(英名psilophytes)といい，マツバラン類などともいう。現生種はマツバラン属とイヌナンカクラン属の2属に分類され，それぞれ独立の科として扱われるが，化石は知られておらず，デボン紀に滅んでしまった古生マツバラン類とは直接の系統関係はないとみなされている。…

※「psilophytes」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