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Chapter 20: Nonvascular Plants: Mosses, Liverworts, and Hornworts…
Chapter 20: Nonvascular Plants: Mosses, Liverworts, and Hornworts
Concepts
Nonvascular plants
Has vascular tissues but not seeds
Spermatophytes
Has both vascular tissue and seeds
Characters of Nonvascular Plants
Classification of Nonvascular Plants
Liverwort
Mosses
Hornwort
Division Hepatophyta: Liverworts
The Gametophyte Generation
thallose liverworts
flat and ribbon like has a body with roots, stems, and leaves
leafy liverworts
resembles moss
The Sporophyte Generation
basic morphology like the moss with little variation
Division Anthocerotophyta: Hornworts
The Gametophyte Generation
small thalloid plants that grow on moist soil
The Sporophyte Generation
No real connections to moss or liverworts
Division Bryophyta: Mosses
The Sporophyte Generation
Seta
narrow stalk between foot and sporangium
operculum
apex of the sporangium
capsule
apical sporangium
peristome teeth
responds to humidity
foot
ftissue interface that absorbs sugars, minerals and water
calyptra
cells from neck of archegonium that proliferate
Metabolism and Ecology
The Gametophyte Generation
leafy stems, grow close and tightly forming mounds
Rhizoids
small multicellular trichome-like structures
Protonema
branched system that undergoes mitosis
Leptoids
resemble sieve tube cells
Antheridia
sperm cells
Hydroids
conduct water and dissolved minerals
Archegonia
egg cells
