BRYOPHYTES Oldest land plants on earth and have been around for 400 million years or more They do not have true vascular tissue and are therefore non-vascular plants Do not have roots, but have rhizoids, which are relatively simple, sometimes multicellular filaments of thin-walled cells that extend from the photosynthetic tissue into the soil
BRYOPHYTES Composed of haploid cells, containing only one set of chromosomes Have a two-stage life cycle: gametophyte and sporophyte There are about 2,000 species of bryophytes Divided into three: moss, liverworts, and hornworts
LIVERWORTS Flowerless, spore-producing plant – with the spores producing in small capsules Typically small; ranging from 2-20 mm wide with individual plants less than 10 cm long Certain species may cover large patches of ground, rocks, trees, or any other reasonably firm substance on which they occur
LIVERWORTS The most familiar liverworts consist of a prostrate, flattened, ribbon-like or branching structure called a thallus (plant body); these liverworts are termed thallose liverworts. However, most liverworts produce flattened stems with overlapping scales or leaves in two or more ranks, the middle rank is often conspicuously different from the outer ranks; these are called leafy liverworts or scale liverworts.
HORNWORTS a flowerless, spore-producing plant - with the spores typically produced in a tapering, horn-like or needle-like capsule which develops from a flattish, green sheet Only 100 species identifies