Enkele minder algemene en gespecialiseerde Chlorophyceae uit een trilveen in het natuurreservaat de Weerribben (NW.-Overijssel)

Algological studies were carried out in a quivering bog in the marshy region of N.W. Overijssel, microscope slides being used as an artificial substrate. A number of ecologically specialised taxa not previously or only rarely recorded from the Netherlands were encountered. The species in question appeared especially during the initial stages of the settling of life forms on the slides. Most of them have hair-like appendages in the form of bristles (setae) or pseudocilia. Conceivably such protruding appendages have a deterrent function in connection with their apparently low competitive power. Among these species, Coleochaete scutata forma minor, Chaetopeltis orbicularis, and Chaetosphaeridium pringsheimii are the commonest and seem to have a relatively broad trophic amplitude. Dicranochaete reniformis (including the forma pleiotricha), Chaetochloris consociata, Gloeochaete wittrockiana, Porochloris tetragona, and Desmatractum bipyramidatum seem to be restricted in their occurrence, at least in the area studied, to mesotrophic, slightly acid sites. The last four species mentioned had not previously been reported from the Netherlands.