Kantha style stitching using #5 Perle Cotton, by Debby Schnabel of DebbyQuilts. See detail at https://www.pinterest.com/pin/38702878027555243/ While this "reads" as bars of satin stitch, it is actually stacks of running stitch.
R is for RUNNING STITCH (STRAIGHT STITCH) The stitch involves inserting the needle into a fabric and taking it out at small intervals. The most basic of hand sewing stitches, from garment-making to embroidery. Information provided by BViz Design | bviz.com