@gavvet, Absolutely brilliant topic also good educative post. Thanks for thinking my mind change different title. I have heard before ferns.But after read your post before 2 hours now, I followed some books to read. Ferns have been in existence for over 300 million years. Many ferns are easily recognizable because of their fronds, or lace-like leaves. However there are many different species of ferns growing around the world, in a variety of habitats and fronds can range in size from less than an inch to well over 12 feet. Many of these early groups of ferns went extinct in the Paleozoic but were eventually replaced by new forms, many of which have survived to the present day. Thanks again to your great gardening post. I wish you Happy and prosperous new year.