Most chromosomes
Ophioglossum reticulatum
1440 total number
Not Applicable ()
The organism with the highest chromosome number recorded in to date is estimated to be 1,440 (or 720 pairs) found in the adder's tongue fern Ophioglossum reticulatum. Original text presents information as: "to date is 2n = ca. 1440 found in..." Ca refers to circa, 2n means the ‘diploid number’- Diploid means having 2 sets of chromosomes. (This is true of most cells - reproductive cells have one set, and some plants have more than 2 sets).