Abstract
The results obtained from the above mentioned investigations may be summarized as follows:
1. According to the chromosome number, species of Linum used by the writer may be classified into four groups having 9, 15, 18 and 43 (?) in haploid numbers respectively.
2. The difference in the size and shape of chromosome was not noted in both gametic and somatic cells.
3. L. usitatissimum did not reveal any variation in the chromosome number, showing always x=15 and 2x=20
4. In the hybrid of L. perenne×L. alpinum, chromosome number in the somatic cell of F1 is the sum of gametic ones of the parental plants, i. e. 9+18=27.
5. In the heterotypic division of pollen mother cells of F2 plant, there is seen the irregular chromosome behavior, where 9 lagging univalent chromosomes separate at random to each pole, and in the homeo-typic metaphase various numbers of chromosomes from 9 to 18 were counted.
6. In the karyological observation of F2 plants, 20, 28 and 34 somatic chromosome numbers were detected in young root tip cells.
