Male plants of the
arctic-alpine moss Cyrtomnium hymenophylloides are present in a
collection of this species from the unglaciated Lena River Valley, Siberia,
Asian Russia. Male plants are otherwise known from near or in unglaciated
refugia in arctic Canada and Alaska. Female plants are more widespread in
northern regions of glaciated North America and Fennoscandia. The differential
distribution of male and female plants, and the apparent absence of sporophytes
in the few known places were males and females occur together, indicate that
there is limited potential of dispersal by spores throughout the range of this
moss, and not only in North America as was previously documented.