Two types of long-wave fluorescence bands with similar band shape occur at room temperature in various algae: FII700 and FI715. FII700 occurs in a limited number of algae, follows PS II transients, increases with culture age and is moderately increased by cooling to 83 K. FI715 occurs in most algae, especially Anabaena, but much less in most diatoms and Tribonema. It does not follow PS II transients, does not increase with culture age and is much increased by cooling to 83 K.An interpretation for the characteristics of FII700 and FI715 is given.