Micrographs showing the overall similarity between representative samples of marine and freshwater sheaths inside microbial mats. The top panels show (a) a light micrograph of a sample taken from a hydrothermal vent with a syringe sampler (J2-481-BS4) and (b) a scanning electron microscope (SEM) image of this sample that shows the fine structure of the sheaths. The lower panels show a sample taken from a local freshwater iron-seep in Maine morphologically dominated by Leptothrix ochracea: (c) a light micrograph and (d) an SEM image showing fine structure of the sheaths. Scale bars for a and c are 15 µm; b and d 5 µm with panel insets 1 µm.

Micrographs showing the overall similarity between representative samples of marine and freshwater sheaths inside microbial mats. The top panels show (a) a light micrograph of a sample taken from a hydrothermal vent with a syringe sampler (J2-481-BS4) and (b) a scanning electron microscope (SEM) image of this sample that shows the fine structure of the sheaths. The lower panels show a sample taken from a local freshwater iron-seep in Maine morphologically dominated by Leptothrix ochracea: (c) a light micrograph and (d) an SEM image showing fine structure of the sheaths. Scale bars for a and c are 15 µm; b and d 5 µm with panel insets 1 µm. Image from Fleming et al., 2013.

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