Abstract
1. Filamentous freshwater algae offer characteristic problems in ecological studies. Identification is often hampered by the lack of characteristic structures, mostly connected with sexual reproduction. 2. Two solutions to this problem are given. First, extended sampling in the field often provides the required structures. Secondly, culturing in the laboratory may offer satisfactory results. 3. Estimation of quantities of several species in a growth of filamentous algae in some cases has to be limited to recognition of presence or absence. 4. Filamentous algae are good indicators for the environmental circumstances and may be used in water pollution control. Well-known saprobity systems however have to be adapted to stagnant water bodies.
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