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.
Modern ferns are familiar spore-producing plants common in a wide range of tropical to temperate environments. Most grow as small to medium-sized bushes, but some are trees while others are aquatic. With approximately 11,500 living species they are second in diversity only to the flowering plants (angiosperms).