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.
Tree ferns are true ferns. Like other ferns, they never flower or produce seeds. They reproduce from spores that grow on the undersides of the fronds or from offsets. A tree fernâs unusual trunk consists of a thin stem surrounded by thick, fibrous roots.The fronds on many tree ferns remain green throughout the year.In a few species, they turn brown and hang around the top of the trunk, much like palm tree leaves.ike other ferns, they never flower or produce seeds. They reproduce from spores that grow on the undersides of the fronds or from offsets. A tree fernâs unusual trunk consists of a thin stem surrounded by thick, fibrous roots. The fronds on many tree ferns remain green throughout the year.