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.
Types of Ferns. Ferns are among the oldest living plants on earth and there are both indoor and outdoor types of ferns. They normally have fronds (leaves) that drape and flow, adding a dramatic touch to a garden or indoor setting. List of Fern Varieties.