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Chapter 20: Nonvascular Plants: Mosses, Liverworts, and Hornworts…
Chapter 20: Nonvascular Plants: Mosses, Liverworts, and Hornworts
Concepts
nonvascular plants (bryophytes)
vascular cryptograms
spermatophytes
Characters of Nonvascular Plants
embryophytes
multicellular sporangia
gametangia
leafy stems
small
simple
Classification of Nonvascular Plants
closely related to
mosses (Bryophyta)
liverworts (Hepatophyta)
hornworts (Anthocerotophyta)
Division Bryophyta: Mosses
The Gametophyte Generation
ubiquitous
perennial
morphology
gametophores
not homologous with vascular plants
water transport
hydroids
leptoids
rhizoids
development
protonema
reproduction
antheridia
archegonia
oogamous
The Sporophyte Generation
foot
capsule
seta
operculum
peristome teeth
calyptra
Metabolism and Ecology
dry weather is dangerous
lives in moist areas
Division Hepatophyta: Liverworts
The Gametophyte Generation
leafy liverworts
thallose liverworts
thallus
air pores
antheridiophore
archegoniophores
The Sporophyte Generation
elaters
Division Anthocerotophyta: Hornworts
The Gametophyte Generation
thin
outer surface is smooth
cannot stand dry climate
The Sporophyte Generation
foot embedded in gametophyte tissue
no seta
no discrete sporangium
