High Quality Content by WIKIPEDIA articles! The pteridophytes are vascular plants (plants with xylem and phloem) that neither flower nor produce seeds, hence they are called vascular cryptogams Instead, they reproduce and disperse only via spores These plants are generally sporophyte-oriented; that is, the normal plant is the diploid sporophyte, ожйеж with the only haploid structure being the gametophyte (prothallium) in season This basic pattern is like that found in the seed plants but with an important exception Unlike the seed plants, the pteridophytes have a gametophyte stage that is free-living As a result, pteridophyte sexuality is more complicated than that of the seed plants.  Directi2010 г Мягкая обложка, 76 стр ISBN 6130350074.