愛媛県産三倍体セフリイノモトソウ(イノモトソウ科) はどのようにして生じたか

A triploid Pteris ×sefuricola n.n. （P. multifida × P. cretica） was discovered in Ehime Prefecture. The chromosome complement of the triploid seems to consist of two genomes of sexual tetraploid P. multifida （mainly short chromosomes） and one genome of P. cretica （mainly long ones）. However, diploid sexual P. cretica has not been recorded so far in Japan. Since 32 well-filled spores are produced in many sporangia, the triploid would propagate by apogamy. We suggest some possible ways to generate this apogamous hybrid