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.
Wood fern (Dryopteris) Plant these delicate, medium-sized ferns in mixed borders to show off their feathery fronds. Autumn ferns (D. erythrosora) are one of the few ferns with seasonal color variation and their fronds change from pale gold and pink in spring to green in summer and rusty copper in fall. The ferns spread by underground stems to form swaths in garden beds.
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.