Who is 'green tail'

hello all.
i've been re-reading 'flying fury' by the James McCudden,VC, and he talks a lot about a 'green tailed' albatros D.V. McCudden and his flight (56 squadron) frequently met with 'green tail' over the Cambrai sector in late 1917. the aircraft of this particular german flight are described as having red noses, yellow fuselages, but with a different colour tail. McCudden always describes the German who flew the green tailed albatros as a skilled pilot. I was just wondering if anyone knew or could tell me who he was. if it helps McCudden shot down a member of 'green tail's' flight on the 6th december 1917 somewhere north of bourlon wood. ( a blue tailed albatros D V.)

cheers!
Phil