Abstract
Genetic homogeneity or heterogeneity of moss populations (mats) was studied through isozyme peroxidase patterns in three Plagiomniam species, Haplohymenium longinerve and Fissidens taxifolius. Large-sized mats of three Plagiomnium species showed two or seven different patterns, but those of H. longinerve and F. taxifolius showed only one pattern. These facts show that populations of comparatively large-sized mosses are genetically heterogeneous, and those of comparatively small-sized mosses are genetically homogeneous. For the purpose of application of isozyme patterns to taxonomy, the peroxidase zymograms of nineteen species of Thuidiaceae and nine species of Fissidens were investigated. Before conclusions from these results can be drawn, however, further investigation is necessary.
