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Chapter 20 (Division hepatophyta: Liverworts (Hepatic gametophytes are…
Chapter 20
Division hepatophyta: Liverworts
Liverworts are small plants that have an alternation of heteromorphic generations
Hepatic gametophytes are divided in two different groups
Leafy Liverworts
Thallose liverworts
Gamete greatly resembles a moss plant.
Leafy
Look less like a moss plant
Thallose
Divisions Anthocerotyphyta: Hornworts
Live in a Small group
Hornwarts are Inconspicuous
Thalloid plants
There are not many similarities between Hornworts and Moss.
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Characters of Nonvascular Plants
Mosses
Lifecycle with alteration of heteromorphic generations
sporohyte and gametophyte differ structurally
Divisions Bryophata: Moses
The gametophyte Generation
Mosses are ubiquitous
Mosses occur in all parts of world
Mosses occur in most enviroments
The sporophyte generation
Megagamete and zygote are retained by the gametophyte
The foot is the interface with the gametophore
Metabolism and Ecology
Two critical factors
Small Size
Lack of Conducting Tissues
There are mechanisms that compensate for the mosses inability to hold water
Classifications of nonvascular plants
Not known how close related Mosses, Hornworts, and liverworts are.
Liverworts
Hornworts
