@abc.abstractmethod<EOL><INDENT>def get_hierarchies_by_genus_type(self, hierarchy_genus_type):<DEDENT>
return<EOL>
Gets a ``HierarchyList`` corresponding to the given genus ``Type`` which does not include hierarchies of types derived from the specified ``Type``.

        In plenary mode, the returned list contains all known
        hierarchies or an error results. Otherwise, the returned list
        may contain only those hierarchies that are accessible through
        this session.

        :param hierarchy_genus_type: a hierarchy genus type
        :type hierarchy_genus_type: ``osid.type.Type``
        :return: the returned ``Hierarchy`` list
        :rtype: ``osid.hierarchy.HierarchyList``
        :raise: ``NullArgument`` -- ``hierarchy_genus_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*