An exception is the yellowish green species Corallorhiza trifida, which has some chlorophyll and is able to fix CO2. However, this species also depends primarily on fungal associations for carbon acquisition.
The statement highlights that while most Corallorhiza species lack chlorophyll and cannot fix carbon dioxide independently, the exception is Corallorhiza trifida, which has a limited amount of chlorophyll and can perform photosynthesis. However, this species also relies heavily on symbiotic relationships with fungi for obtaining carbon.