1969 Volume 82 Issue 977 Pages 436-444
Karyological studies were made on three Japanese species of Asplenium: A. incisum, A. tripteropus and A. oligophlebium. The somatic chromosome numbers of these species were found to be 2n=72, of which A. oligophlebium was first determined. The chromosome number 2n=72 of our A. tripteropus was found to be a half of the number n=72 of which Mitui (1965)1)j proviously found. Essentially, the chromosome complements of these three species can be divided from the morphological view point into six (A-F) types and furthermore, each type can be divided into two groups. From these observations, the primary basic number of Asplenium can be considered to be b=12. Therefore, the species in the genus Asplenium, which possess chromosomes 2n=72, can be considered to be a hexaploid.