Ophioglossaceae, the adder`s-tongue family, is a family of ferns, currently thought to be most closely related to Psilotaceae, the two together comprising the class Psilotopsida as the sibling group to the rest of the ferns. The Ophioglossaceae is one of two groups of ferns traditionally known as eusporangiate ferns. The number of genera included.... Found on http://en.wikipedia.org/wiki/Ophioglossaceae
only family in the fern order Ophioglossales, a primitive group of ferns. The family contains four genera and about 80 species. Its members are ... [1 related articles] Found on http://www.britannica.com/eb/a-z/o/23