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Polystichum acrostichoides, commonly denominated Christmas fern, is a perennial, evergreen fern native to eastern North America, from Nova Scotia west to Minnesota and south to Florida and eastern Texas. [3] It is one of the most common ferns in eastern North America, being found in moist and shady habitats in woodlands, stream banks and rocky ...
Pneumatopteris truncata, also known as the Christmas Island fern, is a species of terrestrial fern in the Thelypteridaceae family. Description
Polystichum is a genus of ferns in the family Dryopteridaceae, subfamily Dryopteridoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). [1] The genus has about 500 species and has a cosmopolitan distribution.
The ferns (Polypodiopsida or Polypodiophyta) are a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers.They differ from mosses by being vascular, i.e., having specialized tissues that conduct water and nutrients, and in having life cycles in which the branched sporophyte is the dominant phase.
Some other species, such as Polystichum acrostichoides (Christmas fern), or some ferns of the genus Osmunda, feature dimorphism on a portion of the frond only. Others, such as some species of Blechnum and Woodwardia, have fertile fronds that are markedly taller than the sterile.
Ferns Boston fern or sword fern – Nephrolepis exaltata; Christmas fern – Polystichum acrostichoides; Coast polypody – Polypodium scouleri; Kimberly queen fern – Nephrolepis obliterata; Korean rock fern – Polystichum tsus-simense; Mosquito fern – Azolla caroliniana; Sword ferns – Polystichum spp. Water fern – Azolla caroliniana