What does the inside of a leaf look like and why do leaves have all of those 'pipes'? On the outside surfaces of a leaf are stomata, but have you ever wondered what they are for? Where do pollen grains come from and are flowers really just modified leaves? Microscopic Worlds, Volume 3 examines some of the earliest life-forms, describing the continuing impact these organisms have on planet Earth. Follow the development of fungi from spore germination through to maturity and reproduction, all in brilliant 3D.