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Fig. S1 Stable and unstable bubbles at the top of a small photosynthetic tube formed at room temperature at 0 h (beginning of the imaging experiment) and at 29.5 h (the end of the experiment).

Fig. S2 Vertical growth of the mat around photosynthetic bubbles.

Fig. S3 Gas is supplied from the underlying mat to the cm-scale unstable, non-spherical bubbles.

Fig. S4 Calcium carbonate minerals are found in the regions of abundant extracellular polymeric substances stainable by Calcofluor White.

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FilenameFormatSizeDescription
GBI_227_sm_fS1.tif359KSupporting info item
GBI_227_sm_fS2.tif519KSupporting info item
GBI_227_sm_fS3.tif447KSupporting info item
GBI_227_sm_fS4.tif723KSupporting info item

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.