Section 10-148. Fines for unlawful cutting of trees on city property other than trees under the jurisdiction of the department of parks and recreation

It shall be unlawful for any individual, firm, corporation,  agent,  employee or person under the control of such individual, firm or
  corporation to cut, remove  or  in  any  way  destroy  or  cause  to  be
  destroyed,  any tree or other form of vegetation on any public property,
  without acquiring written consent from the agency having jurisdiction or
  control of such property. The foregoing provision  shall  not  apply  to
  employees  of  any  agency  who are engaged in the proper and authorized
  performance of their assigned duties.