Phototrophic microorganisms (algae, cyanobacteria) can grow on stone surfaces or may penetrate the pore system of the stone itself. Phototrophic microorganisms have a direct effect on the deterioration of stone due to their pigments which cause an aesthetically detrimental effect.

Filamentous cyanobacteria (Nostoc sp, Leptolyngbia sp., Stigonema ocellatum) and green algae (Desmococcus olivaceus and Haemaotococcus pluvialis) are capable of forming dense mucous-like layers on surfaces which produce characteristic colourations on the substrata.

Nostoc. sp can produce blackish-green pigmentation which leaches into the substrate on which it is growing.


Have to say, Elite K Render Cleaning went above and beyond to keep everything clean while they were working on our house, money well spent seeing as it was looking tired and frayed around the edges.

A few of our neighbours asked for their number within weeks of them leaving.

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