Fig. 3: Details of a hypha along its extension in back-scattered ESEM-images.

a Details of an individual hypha that extends for ~1500 µm. It starts from biofilm on a quartz crystal in the cavity. b A hyphal bridge at the mineral surface is shown. The hypha extends with septa at every 50–60 µm (c), and has a spherical/coccoid structure at the tip (d).