Phaeocryptopus gaeumannii or Swiss needle cast is a fungus that infects Douglas fir and causes yellowing of foliage and reduction in growth. It is endemic in western North American stands of Douglas fir, but was first discovered in trees planted Switzerland. The classification of Phaeocryptopus gaeumannii within the Venturiaceae has been questioned, with molecular studies placing it in the Mycosphaerellaceae (Capnodiales) near species of Mycosphaerella and Rasutoria species: Rasutoria pseudotsugae and Rasutoria tsugae.