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Bryophytes

Bryophytes. Amanda Clow Thuy-My Le Christoph Stephenson-Moe. Types of Bryophytes. There are three groups of bryophytes Mosses are the most common with about 10,000 species Liverworts (leafy and thallose) Hornworts. Mosses. Hornworts. Liverworts. Thallose. Leafy. General Facts.

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Bryophytes

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  1. Bryophytes Amanda Clow Thuy-My Le Christoph Stephenson-Moe

  2. Types of Bryophytes • There are three groups of bryophytes • Mosses are the most common with about 10,000 species • Liverworts (leafy and thallose) • Hornworts

  3. Mosses Hornworts

  4. Liverworts Thallose Leafy

  5. General Facts • Bryophytes are land plants. • They are the oldest land plants on Earth. Fossil records indicate they are 475 million years old. Molecular genetics suggest they may even be 700 million years old. • They are simple plants that evolved from green algal ancestors They are well-adapted to moist habitats and lack cuticles so as to readily absorb water. A few can adjust to surviving in dry climates. • They tend to be low-lying and have no roots. Instead they have filamentous rhizoids. • Sometimes, if in a really moist area, they may grow as epiphytes (plants that grow on other plants).

  6. Bryophytas are non-vascular. • They have no xylem or phloem that circulate liquids. • Instead, some types of bryophytes (specifically mosses), have specialized transport cells called hydroids and leptoids. • However, they do have tissues and enclosed reproductive systems. • They absorb nutrients at the surface and pass them from cell to cell.

  7. Bryophyte Sexuality • Bryophytes alternate generations, but are predominantly gametophytes. The gametophyte reproductive organs produce eggs and sperm and once they join to form a zygote, the sporophyte grows from the gametophyte and is dependent on it for nutrients. It releases spores that germinate and divide to develop into gametophytes, starting the cycle over. • They can be dioicous (separate males and females) or monoicous (male and female organs are on the same plant) depending on environmental conditions. • They do not have flowers or produce seeds.

  8. Sources • "Bryology - Royal Botanic Garden Edinburgh." Royal Botanic Garden Edinburgh - Home. 03 Mar. 2009 <http://www.rbge.org.uk/science/cryptogamic-plants-and-fungi/bryology>. • "Bryophyte Photos." WAYNE'S WORD. 05 Mar. 2009 <http://waynesword.palomar.edu/bryoph1.htm>. • "Bryophytes - introduction." Faculty of Pure and Applied Sciences, The University of West Indies at Cave Hill, Barbados. 03 Mar. 2009 <http://scitec.uwichill.edu.bb/bcs/bl14apl/bryo1.htm>. • "Home Page." University of North Alabama. 05 Mar. 2009 <http://www.una.edu/faculty/pgdavison/bryophytes.htm>. • "What is a Bryophyte?" WiseGEEK: clear answers for common questions. 05 Mar. 2009 <http://www.wisegeek.com/what-is-a-bryophyte.htm>.

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