Ophioglossaceae, family of four or five genera and about 100 species of primitive ferns (order Ophioglossales). The genus Ophioglossum (adder s-tongue ferns), with 46 tropical and temperate species, has sporangia in two rows near the tip of a usually unbranched narrow fertile The family Ophioglossaceae is in the major group Pteridophytes (Ferns and fern allies). The status of the 350 species names for the family Ophioglossaceae Ophioglossaceae, the adder's-tongue family, is a small family of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is the only family in Ophioderma redactophylla (Ophioglossaceae), a new fern from the Malay Peninsula. Bower, F.R.S. (1904) Ophioglossum simplex Ridley. Annals of Botany The Ophioglossaceae are one of two extant eusporangiate fern families and apparently have no close affinities to other extant ferns. Recent
Best books online from Douglas Houghton Campbell The Affinities of the Ophioglossaceae and Marsiliaceae (1904)
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