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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 ...
Onoclea sensibilis, the sensitive fern, also known as the bead fern, is a coarse-textured, medium to large-sized deciduous perennial fern. The name comes from its sensitivity to frost, the fronds dying quickly when first touched by it. It is sometimes treated as the only species in Onoclea, [2] but some authors do not consider the genus ...
Key users must overcome many practical problems, such as: Variant forms: The key may identify only some forms of the species, such as adult males (or, more rarely, females). Keys for larvae identification may consider only the final instar. (This is not the case, however, of keys used in forensic identification of fly larvae.)
Gymnocarpium dryopteris, the western oakfern, common oak fern, oak fern, [1] or northern oak fern, is a deciduous fern of the family Cystopteridaceae. It is widespread across much of North America and Eurasia. It has been found in Canada, the United States, Greenland, China, Japan, Korea, Russia, and most of Europe.
Growing in wild. Fronds closeup. Nephrolepis cordifolia is an evergreen fern that grows to between 40 and 80 centimeters, in extreme cases up to 1 meter. It forms an underground rhizome in the form of several small tubers. The pinnate fronds are erect and pinnate linear to lanceolate, glandular and simple. The rachis bears bicolored chaff scales.
Polypodiaceae is a family of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family includes around 65 genera and an estimated 1,650 species and is placed in the order Polypodiales, suborder Polypodiineae. [1] A broader circumscription has also been used, in which the family includes other families kept separate ...
Azolla (mosquito fern, duckweed fern, fairy moss, water fern) is a genus of seven species of aquatic ferns in the family Salviniaceae. They are extremely reduced in form and specialized, looking nothing like other typical ferns but more resembling duckweed or some mosses .
Nephrolepis exaltata, known as the sword fern[1] or Boston fern, is a species of fern in the family Nephrolepidaceae. [2] It is native to the Americas. [1] This evergreen plant can reach as high as 40–90 centimetres (16–35 in), and in extreme cases up to 1.5 metres (4 ft 11 in). It is also known as the Boston sword fern, wild Boston fern ...