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The most striking and unusual feature of the fern is its simple, strap-shaped undivided fronds. The supposed resemblance of the leaves to the tongue of a hart (an archaic term for a male red deer) gave rise to the common name "hart's-tongue fern". Asplenium scolopendrium. Asplenium scolopendrium sori. Asplenium scolopendrium prothallus
Asplenium rhizophyllum plantlet sprouting from the leaf apex of its parent plant. The stipe (the stalk of the leaf, below the blade) is 0.5 to 12 centimetres (0.20 to 4.7 in) long [2] (occasionally up to 15 centimetres (5.9 in) long), and ranges from one-tenth to one and one-half times the length of the blade.
Ophioglossum vulgatum, commonly known as adder's-tongue, [1] southern adder's-tongue or adder's-tongue fern, is a species of fern in the family Ophioglossaceae. [ 2 ] The chloroplast genome was reported to have a size of 138,562 base pairs.
Ophioglossum, the adder's-tongue ferns, is a genus of about 50 species of ferns in the family Ophioglossaceae. The name Ophioglossum comes from the Greek meaning "snake-tongue". [ 3 ] Their cosmopolitan distribution is mainly in tropical and subtropical habitats .
Ophioglossum lusitanicum is a small winter annual fern, and consists of a simple sterile blade attached to a spike-like fertile blade with between three and eight sunken sporangia on either side. The whole plant rarely exceeds a height of 2 cm. [4] This species has a chromosome number of 2n = 250–260. [4]
Glossopteris (etymology: from Ancient Greek γλῶσσα (glôssa, " tongue ") + πτερίς (pterís, " fern ")) is the largest and best-known genus of the extinct Permian order of seed plants known as Glossopteridales (also known as Arberiales, Ottokariales, or Dictyopteridiales).