Abstract. -Geotrichum candidum is a yeast-like filamentous fungus common in nature, which occasionally causes geotrichosis especially in the bronchopulmonary area.The basic material of this study consisted of fungal cultures on many different culture media, of 6801 morning sputa and 1289 other bronchopulmonary specimens from patients chiefly with pulmonary disease. For purpose of comparison fungal cultures were additionally made of 1495 upper respiratory tract and 1711 faeces and gastric juice samples. The mean incidences of occurrence of Geotrichum candid urn were 0.5 % in bronchial secretion, 1.8 % in morning sputum, 2.5 % in the upper respiratory tract, 2.6 % in gastric juice and 13 .2 % in faeces.