The Use of marK in Ophioglossaceae Phylogeny and the Determination of Mankyua Chromosome Number Shed Light on Chromosome Number Evolution in Ophioglossaceae.

The article determines the chromosome number and phylogenetic position of the monotypic eusporangiate genus Mankyua (Ophioglossaceae). It discusses the meiotic and mitotic chromosome observations of Mankyua and cites the suggestion that the base number of the genus is x = 130. The difference of the molecular phylogenetic trees derived from nucleotide sequence variation of rbcL and matK genes in terms of the phylogenetic position of Mankyua is also highlighted.