Eight species of aero-aquatic hyphomycetes were tested for survival on garden soil under field conditions, prolonged drying in the laboratory and desiccation over silica gel. In the field three species survived after 11 months, one for 8 months, two for 6 months and two for 2 months. Under laboratory conditions one species survived for 10 months, one for 8 months, two for 3 months, two for 1 month and two for 7 days. In a desiccator one species survived for 9 months, one for 3 months, four for 1 month and two for 7 days. Pure mycelia of 12 species were dried under laboratory conditions and tested for survival. Three species survived for 5 months, one for 4 months, two for 2 months, two for 1 month and four for less than 1 month. Spores of eight species were subjected to desiccation over silica gel. Six species survived for 10 days but were dead after 20 days. The remaining two species survived for less than 10 days. The results are discussed in relation to the ecology of the organisms.