Hi Gunnar,
We both know of a III Marine Landflieger Abteilung in the summer of 1915 at Nieuwmunster airfield, however on the 20th september 1915 her existence was ended as she became the II Marine LFA, while I and original II MLFA became I MLFA with two Halbabteilungen.
However this is weird. The Stiefvatter story comes out of the same text. Some kind of mixup ? I will try to contact the author to know his sources, he's from the Brugge area.
VBR from Regulus