The Mosses, Liverworts and Hornworts Bryophytes The Mosses, Liverworts and Hornworts

A Tribute to Moss http://www.youtube.com/watch?v=MWRazeU hg44&feature=player_embedded

Location Water vs Land Algae – mainly aquatic Moss – damp, shady locations What challenges do plants have to overcome to live on land?

General Characteristics Non-vascular plants (no pipes) Transport water by osmosis Found in moist shady areas One cell thick leaves; lack cuticle = more evaporation

General Characteristics Rhizoids – anchor to ground Rhizome – underground stem Lack true roots, do not play a major role in absorption Flagellated sperm

Bryophytes 3 Main types Mosses Liverworts Hornworts

Mosses

Liverworts

Hornworts

Mosses Class Musci: true moss Gametophyte dominant Male and female usually separate

Structure

reproduction Similar to algae Asexual: Sexual: Fragmentation Water transports sperm to egg in moist environment

Assignment What are the three groups of bryophytes? Algae live mainly in the water and mosses live on land. What features do mosses have that have allowed them to do this? What features do more complex land dwelling plants have that mosses lack? Are the gametes of bryophytes haploid or diploid? Are the spores of bryophytes haploid or diploid? Describe the life cycle of a moss. You can draw a labelled diagram if you want. Is the dominant part of the mosses life cycle spent as a sporophyte or gametophyte?