Fig. 8

The biofilms sloughing from a brick surface with the surface part of the substrate, the detached mineral grains are pointed by dashed arrows (a) Chloroidium saccharophilum PNK010, (b) Klebsormidium nitens PNK013, (c) Diplosphaera chodatii PNK021, (d) Stichococcus bacillaris PNK040.