NON-VASCULAR PLANTS

  1. Bryophyta (mosses)
    A. Moss is actually thousands of tiny moss gametophytes. B. Each gametophyte is attached to the soul by rootlike structures called rhizoids- 1. Absorb water, 2. Serve as anchors. C. Have leaf like structures only one cell thick that carry out photosynthesis and absorb moisture.
  2. Reproduction of Bryophyta
    1. Occasionally will produce eggs and sperm. 2. Forms a zygote which produces a stalklike sporophyte(2N). 3. Sporophyte forms a sporangium called a capsule which releases spores. 4. The spores grow into gametophytes (1N).
  3. Bryophyta Cont'd
    Seldom grow large. Most lie close to the soil or bark of trees. No complex support or vascular system. Need water for reproduction. Sperm must swim to an egg. Can be found in moist cracks in desert. Reproduce during periods of moisture.
  4. Hepatophyta (liverworts)
    A. Some have a thalloid form- a flat body that has distinguishable upper and lower surfaces. B. Others have a leafy form with thin, transparent, leaflike structures arranged along a stemlike axis. C. Lie close to the ground in moist environment.
  5. Anthocerophyta (horn warts)
    A. Resemble liverworts but their sporangia are different. B. Share an unusual characteristic with algae; each of tier cells has a single large chloroplast rather than numerous small ones.