The sections of the light spectrum which the âredâ and âgreenâ cones perceive overlap and this is why red and green colour vision deficiencies are often known as red/green colour blindness and why people with red and green deficiencies see the world in a similar way.
Boston Fern The most common indoor fern, Boston ferns are long-lived plants that can reach more than 5 feet tall and wide at maturity (though indoors they rarely reach that size). Fern breeders have released a large number of varieties -- from selections with golden fronds to fantastically frilled fronds.
They were thriving on Earth for two hundred million years before the flowering plants evolved. As we know them now, most ferns are leafy plants that grow in moist areas under forest canopy. They are vascular plants with well-developed internal vein structures that promote the flow of water and nutrients.