SUMMARYExperiments on the germination of the spores ofFunariahave established the following.1Some growth substances such as vitamins slightly promote the geotropic response of germinating spores in darkness.2Glucose, even in concentrations as low as 10 mg./L, strongly stimulates the geotropic response.3Light (at an intensity of 1000 lux and more) strongly inhibits the geotropic response. This effect is probably phototonic and can be partly counteracted by glucose.4The nature of the phototropic and geotropic reactions of chloronema is variable, and depends to a certain extent on environmental influences.