He Who Must Not Pollinate

It's allergy season in full force, and I totally blame that for me feeling less than spectacular (of course it's not the lack of sleep). Anyway, I was walking to Hist/Lit today where the [whatever it is] tree has dumped all sorts of long-ish green things that I can only assume are bursting with pollen. As I hopped up the steps into OP, I noticed that the green had formed an odd shape. Upon closer examination, I realized with horror that it bared a striking similarity to the dark mark.

Ladies and gentlemen, please remain calm, but I think Voldemort is behind allergy season.