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Transcript of Liverworts
"the simplest true plants."
•Liverworts got its name from its
shape (liver) and "wort" means plant
•There are two classes of liverworts,
which are separated by their physical
- Jungermanniidea (leafy liverworts)
-Marchantiopsida (complex thallose liverworts)
•Can be found almost anywhere in the world
•Reproduces through asexual reproduction,
and sexual reproduction •The most familiar liverworts consist of a prostrate, flattened, ribbon-like or
branching structure called a thallus (plant body)
•Instead of roots they have hairlike rhizoids that anchor them and absorb
•No vascular tissues
•Unlike, tree leaves have window-like
stomata which close when the leaf is
threatened with drying out;
liverworts have nothing like
stomata, so the whole plant
shrivels when dry. Liverworts are found literally everywhere.
They grow in persistently moist environments, such as in fresh water, on forest floors, waterfall splash zones, and stream banks, some are well adapted to microhabitats where water is limited.
The ocean and other salty aquatic habitats are the only environments where liverworts are absent. •Liverworts are photosynthetic plants.
•Bryophytes satisfy their nutritional requirements by absorbing minerals from dust, rainfall, and water running over their surface.
•And because they lack true roots (and they only have rhizoids), they must stay in contact with water.
•Each cell that accomplishes photosynthesis contains a single pore, which can release oxygen and bring in a fresh supply of carbon dioxide, but which cannot be closed. Asexual or vegetative reproduction,
and sexual reproduction This moss-like liverwort has broad leaves with smooth margins. These distinctive and primitive leafy liverworts are placed in their own order, the Calobryales. Found on damp shaded banks throughout the country. Sources: http://doralbio8.wikispaces.com/file/view/liverworts-close-up-web.jpg/204139426/liverworts-close-up-web.jpg
12Lect/GB101Summer_Lect6.htm •Most liverworts are small, usually from 2–20
millimetres (0.08–0.8 in) wide with individual plants less than 10 centimetres (4 in) long Haplomitrium gibbsiae Monoclea
forsteri Marchantiaberteroana Monoclea forsteri is a large, thallose liverwort of a dark green or of an olive green colour. The thallus reaches a maximum length of 20 cm. and a width of 5 cm. It branches dichotomously at frequent intervals, the resulting structure being irregularly lobed with some portions
growing over others. The thallus of Marchantia berteroana is yellow-green to green or reddish-brown, 600–900 m thick, with branches up to 20 mm long and about 12 mm wide with wavy margins. The thallus has scales on the lower surface (ventral scales) that extend nearly to the margins, and rhizoids (hair-like structures that act as roots) with which it attaches to its substrate. Liverworts •Canopy humus
•They are used by birds to build their nests.
•Role in succession
•Very effective rainfall interceptors
•Abundance of epiphytic liverworts in “cloud” or “mossy” forest zones is considered an important factor in eliminating the deteriorating effect of heavy rains, helping to prevent soil erosion and adding to hill stability.
•Potential indicators of large-scale changes to an ecosystem before the habitat or ecosystem itself is affected