fern
Ferns (Polypodiopsida or Polypodiophyta) are a group of flowerless and seedless plants. They do not have fronds and roots, and reproduce via spores. Their foliage formation is triangular.
External links
蕨类植物（polypodiopsida或polypodiophyta）是一组无花果和无种子植物。它们没有叶状和根，并且通过孢子繁殖。他们的叶子形成是三角形的。