“…Not only are there a number of chromosomally homo-morphic species, such as C. rublcunda, occupying a variety of habitats, but even those species, such as C. amoena and C. unguiculata, which are chromosomally extremely polymorphic, have one arrangement that is characteristic of the species and occurs in high frequency throughout its range, except perhaps for occasional colonies (Hakansson, 1946;Mooring, 1958).…”