Nephroma antarctica Nephroma arcticum Nephroma bellum Nephroma expallidum Nephroma helveticum Nephroma isidiosum Nephroma laevigatum Nephroma occultum Nephroma parile All species of Nephroma contain cyanobacteria (in the genus Nostoc) as a photobiont, which allows the organism to fix nitrogen. In some species the cyanobacteria is the sole photobio... Found on http://en.wikipedia.org/wiki/Nephroma