This is a genus of only ten species all of which apart from C. trifida, are exclusively north American.
species are all saprophytic and depend on mycorrhizal fungus for the
majority of their nutrition, they do however maintain a
significant amount of chloraphyll in their their stems and are therefore able to manufacture some of their food via photosynthesis .
capability accounts for the greenish colouration of the plants
and in the case of C. trifida, serves to differentiate it from the
other European saprophytes which contain no chlorophyll at all.
Unlike these species however, it rarely reproduces vegetatively and
relies almost entirely on self pollination.