Data from: An update and reassessment of fern and lycophyte diversity data in the Japanese Archipelago

The fern and lycophyte flora of Japan comprising 721 native taxa
(including subspecies and varieties) plus 371 interspecific hybrids was
reassessed using a nearly comprehensively sampled distribution map at
10 km resolution vouchered by 216,687 specimens, up-to-date
cytotaxonomic information covering 74% of the taxa, and an rbcL sequence
dataset covering 97.9% of the taxa. Spatial distribution of
species richness and phylogenetic diversity was visualized.
Apomixis was observed in 11.0% of the native taxa whose reproductive modes
are known. The number of sexually reproducing polyploid taxa (n = 199) is
less than sexual diploids (n = 241), and 30 of them are evidently
allopolyploid, in contrast with the low number of possible autopolyploids
(n = 4). Apomictic taxa were found to have smaller latitudinal ranges than
sexual taxa or taxa with multiple reproductive modes. A
morphological character dataset in Lucid format is provided for taxonomic
identification of the native taxa.