IntroductionPlants are autotrophs that produce their own organic nutrients to sustain themselves, through a complex process called photosynthesis. The plant kingdom is diverse and composed of plants of different biological diversity (Raven et al. 2005). Cryptograms or seedless plants are vascular plants that do not produce seeds for dispersal but reproduce by wind-blown spores. In seedless plants, the gametophyte and sporophyte are both independent phases of the plant's life cycle. Like all vascular plants, cryptograms have true roots, stems and leaves. Sperm are flagellated and need water to reproduce. These plants are therefore limited to humid areas. It is assumed that many seedless vascular plants were once tree-sized at one time ("Lycopodium", September 28, 2012). Table 1: Various plants of the plant kingdom and their key characteristics. Cryptograms and vascular tissuesThe word vascular is synonymous with the word transport. Vascular tissue is the complex transport network found in plants that helps transport water and organic nutrients throughout the plant body. In vascular plants, approximately 93% of their tissues are vascular. There are two main types of vascular tissue, phloem and xylem (Gregory). XylemXylem is composed of two types of elongated water-conducting cells. Tracheids along with fibers and parenchyma cells constitute the xylem. The function of xylem in the plant is to transport water and salts throughout the plant ("Vascular Tissues in Plants" 2004).PhloemPhloem, unlike xylem, is made up of living tissues called sieve tube elements, which consist of the sieve tube and a companion cell. The elements of the sieve tube together with the sclereids and parenchyma form...... middle of paper ...... in Trinidad and Tobago. I would strongly recommend that a checklist be established as soon as possible by the National Herbarium of Trinidad and Tobago. The limitations of this research are numerous. Works cited by Peter Raven, Ray Evert and Susan Eichhorn. 2005. “Plant Biology.” New York: Freeman and Company.Palaeos.org, “Lycopodium.” Last modified September 28, 2012. Accessed November 19, 2013. http://www.palaeos.org/Lycopodium.Gregory, Michael. The Web of Biology, “Seedless Plants”. Accessed November 19, 2013. http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio 102/bio 102 lectures/seedless plants/seedless plants.htm. “Vascular tissues of plants,” National Biology Support Service (NBSS) (2004): 1-2, Radboud University Nijmegen, “Lycophyta (Lycopodium, Selaginella).” Accessed November 20, 2013. http://www.vcbio.science.ru.nl/en/virtuallessons/lycophyta/.