FERNS AND FERN ALLIES

"Ferns have been with us for more than 300 million years and in that time the diversification of their form has been phenomenal. Ferns grow in many different habitats around the world. The ferns were at their height during the Carboniferous Period (the Age of Ferns) as the dominant vegetation at that time. During this era some fern-like groups actually evolved seeds. Much later these seed ferns, gave rise to the flowering plants. Most of the ferns of the Carboniferous became extinct but some later evolved into our modern ferns. There are about 12,000 species in the world today. The leaves or fronds vary greatly in size, from tree ferns, with fronds up to 12 feet long to the mosquito ferns with fronds only 1/16 of an inch long. The arrangement of the reproductive structures of ferns varies greatly. Ferns drop millions, often times billions of spores during their lifetime but very few ever land in a spot suitable for growth."

DR. FRANCESCA T. GRIFO, FORMER DIRECTOR, CENTER FOR BIODIVERSITY AND CONSERVATION

 

 

KNOWN SPECIES

13,000

SIZE RANGE

2 centimeters to more than 24 meters tall

WHERE THEY LIVE

In fresh waters and in moist temperate and tropical areas on land

ECOLOGICAL ROLES AND HUMAN USES

At the base of the food chain • Some aquatic ferns live in symbiosis with bacteria that convert atmospheric nitrogen into compounds utilized by rice plants • Provide habitat for other species, and shape environments • Stabilize soils • Used by humans for food and in industry, and as ornamental plants

Spectrum of Life
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