Abstract
Enzyme-electrophoretic variation was examined in sporophytes of Woodwardia japonica (2n= 68) and segregation was examined in gametophytes. Despite the high chromosome number, W. japonica displayed disomic segregation of isoenzyme patterns. This and karyotype analyses indicate that W. japonica is a diploid derived from a base number of either x= 17 or x= 34.
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