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Unformatted text preview: they are uncommon in our world today helps increase their value to collectors, but puts cycads at great risk for poaching from their native habitats, reducing their numbers even more. The safest place today for a cycad is in a botanical garden or preserve. Vegetative Characteristics of the Cycad Sporophytes: Cycads are slow-growing woody shrubs with a short or columnar unbranched stem, up to about 15 meters tall in the largest species. Most are less than 2 meters tall. The stem has a terminal crown of long, leathery, pinnately compound leaves. Cycad leaves have circinnate vernation (like ferns). Some cycads form root associations with nitrogen-fixing Cyanobacteria. The roots that host the Cyanobacteria form at the substrate surface providing light penetration for the Cyanobacteria to photosynthesize....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.
- Fall '09