Lesson 5 - Non-Vascular Plants

• THE NON-VASCULAR PLANTS

  1. LACK TRUE CONDUCTING TISSUES, SHOOTS(LEAVES AND STEM), AND ROOTS
  2. HAPLOID GAMETOPHYTES ARE THE DOMINANT PHASE
  3. NEED MOIST HABITAT FOR REPRODUCTION
  4. DO NOT PRODUCE FLOWERS OR SEEDS.
  5. GENERALLY REACH ONLY UP TO 2CM IN HEIGHT
  6. BECAUSE OF LACK OF WOODY TISSUES FOR SUPPORT.
• imbibe water lying on their surfaces and gradually distribute it to the plant body by diffusion, capillary action or protoplasmic streaming.
• Bryum argenteum, the silvergreen bryum moss

  -A cosmopolitan moss species. It can be found in many parts of the world, including Europe, North America, the deserts of Australia and in Antarctica.
• Asterella drummondii, a thallose liverwort found in the dry areas of Australia
• In the Philippine National Herbarium (PNH), about 6,000 specimens of bryophytes are deposited.
• The oldest bryophyte collection in PNH is Papillaria crocea from the family Metioriaceae.
• The genus Acroporium from the family Sematophyllaceae accounts for the most number of collected specimens in PNH. It is the largest moss family in the country and has around 24 endemic species recorded.
• Sporophyte- the diploid generation
• sporangia undergo meiosis to form spores.
• homosporous the spores are of one type only.
• The spores germinate to produce the haploid gametophyte(s) that will eventually form the gametes:

  • male gamete or sperm, often in an antheridium
  • female gamete or eggs, in an archegonium.
• Division Marchantiophyta (old name: Hepatophyta) -liverworts
• Division Anthocerotophyta - hornworts

  The common name refers to the elongated horn-like structure, which is the sporophyte.
• DIVISION BRYOPHYTA – mosses

  • About 20,000 species
  • Grow in mat formation
• Moss sporophyte

  Peristome teeth - aid release of spores
• The male gametophyte produces clusters of antheridia which contain thousands of ciliated sperms.
• The female produces archegonia, each containing a single egg.
• Mosses are categorized into three

  classes:

  -Peat Mosses (Sphagnopsida)

  -Granite Mosses (Andreaopsida)

  -"True" Mosses (Bryopsida)
• distinguished by leaves that are one cell thick and mostly possessing two types of cells

  – photosynthetic cells that possess chloroplasts and that form a network arrangement, and hyaline (colorless) cells that are dead at maturity
• Granite moss, Class Andreaopsida

  are a basal group of mosses commonly found

  growing on exposed rock surfaces.
• "True" Mosses (Bryopsida)

  -“joint-toothed” or “arthrodontous” mosses

  Largest group: 95%