Introducing Professor Elwood Prickelthorn, ; alter ego of Warren Hoselton, .  Tree aficionado, internationally certified arborist, and supervisor of Toronto Island Parks, City of Toronto. What a mouthful.  His impressive resume can be seen on the Professor Pricklethorn website. Since Graduating from Humber College with a Horticulture and Aboriculture Diploma in 1982, Warren has worked passionately to promote…