The genus " Ophioglossum " has the highest chromosome counts of any known plant.
2.
It is closely related to, and sometimes treated as a subgenus of, the genus " Ophioglossum ".
3.
It is a fern in the Ophioglossaceae family, and many people still classify it as an " Ophioglossum ".
4.
The record holder is " Ophioglossum reticulatum ", with about 630 pairs of chromosomes ( 1260 chromosomes per cell ).
5.
This species is thought to be derived from a hybrid between " Ophioglossum vulgatum " and " Ophioglossum lusitanicum ".
6.
This species is thought to be derived from a hybrid between " Ophioglossum vulgatum " and " Ophioglossum lusitanicum ".
7.
Members of Ophioglossaceae are usually terrestrial ( excepting a few epiphytic species of " Ophioglossum " ) and occur in both temperate and tropical areas.
8.
It is the only site in Great Britain and Ireland for the small fern, least adder s tongue ( " Ophioglossum lusitanicum " ).
9.
She published " A Revision of the North American Species of " Ophioglossum ", " the adder's-tongue ferns, in 1897.
10.
The high record would be somewhere amongst the ferns, with the adder's tongue fern " Ophioglossum " ahead with an average of 1262 chromosomes.
