Monthly Monday Macro - 20

December already and almost another year of Monday macros gone by!  You should know the drill by now.  All that I ask is that you've won already you give a little time for others to give a shot before throwing in a guess.  So who thinks they know what this might be?

Dec 1, 1:50pm updated with the answer which was moss.  Congrats to Tracy on Facebook who got it in short order.