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.
Interesting Facts about Non-Flowering Plants. 1  The leaves of ferns are called fronds. 2  Scientists estimate that some species of ferns have been around for over 350 million years. 3  Conifers often have needle shaped leaves. Needles are tough, don't dry out, and will not easily fall off in high winds. 4  There are over 12,000 different species of mosses.