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.

中文翻译：

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日本群岛蕨类植物和石松植物多样性数据的更新和重新评估。

日本的蕨类植物和石松植物区系由 721 个本地类群（包括亚种和变种）以及 371 个种间杂种组成，使用分辨率为 10 公里的近乎全面采样的分布图进行了重新评估，该分布图由 216,687 个标本提供，最新的细胞分类学信息涵盖了 74% 的蕨类植物和石松植物区系。类群，以及覆盖 97.9% 类群的 rbcL 序列数据集。物种丰富度和系统发育多样性的空间分布可视化。在已知生殖方式的本地类群中，有 11.0% 观察到无融合生殖。有性繁殖多倍体类群的数量 (n = 199) 少于有性二倍体类群 (n = 241)，其中 30 个明显是异源多倍体，而可能的同源多倍体数量较少 (n = 4)。研究发现，无融合生殖类群的纬度范围比有性类群或具有多种生殖模式的类群更小。提供了 Lucid 格式的形态特征数据集，用于本地类群的分类识别。