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.
Several non-fern plants (and even animals) are called ferns and are sometimes confused with true ferns. These include:  1 Asparagus fernâThis may apply to one of several species of the monocot genus Asparagus, which are flowering plants.  2 SweetfernâA flowering shrub of the genus Comptonia.everal non-fern plants (and even animals) are called ferns and are sometimes confused with true ferns. These include:  1 Asparagus fernâThis may apply to one of several species of the monocot genus Asparagus, which are flowering plants.  2 SweetfernâA flowering shrub of the genus Comptonia.