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.ern-like flowering plants [edit]. Some flowering plants such as palms and members of the carrot family have pinnate leaves that somewhat resemble fern fronds. However, these plants have fully developed seeds contained in fruits, rather than the microscopic spores of ferns.