Cytological Studies of Salviniaceae I

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Abstract
Karyological studies were made on 2 species belonging to the genus Salvinia, of which the chromosome numbers are as follows; S. natans 2n=18, S. cucullata 2n=45. The somatic chromosome complements of S. natans can be morphologically divided into 9pairs, and those of S. cucullata can be divided into 9 groups which correspond to the 9pairs in S. natans. Meiosis is regular in S. natans, but irregular in S. cucullata, because of the chromosomes being univalents to tetravalents at metaphase I, and many lagging chromosomes at anaphase II. Therefore, the basic number of the genus Salvinia can be considered to be x=9, and S. cucullata can be considered to be an allopentaploid plant.

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