Group Mechanics 14 (Source)

Harvesting / Resources

   * There will no longer be a penalty to harvesting while in a group.  Instead, there will now be a 20% harvesting bonus if you are in a group and at least one group member is within 64m of you when you harvest.  If there is a Ranger present in your group and is within 64m of you, the group harvesting bonus will be 30% for you when you harvest.  If there is a Master Ranger present in your group and is within 64m of you, the group harvesting bonus will be 40%.