Pattern is written for an aran yarn and a fingering yarn held together, resulting in a bulky gauge. Yardages given here range from yardage for the aran yarn alone to the combined yardage for both yarns.
Short rows are used to create the ruffled edges.
From Knitting New Scarves:
“This scarf was inspired by a spectacular, broad-leafed seaweed with fluttering edges called Laminaria. I wanted it to be more than just a large ruffle, so I created a wide central core with narrow rippled edges. If you prefer a narrower scarf, you can easily decrease the width by eliminating some of the central Garter stitches.”