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Origin of Land Plants
About 1 billion years ago, a cyanobacterium was engulfed by an early eukaryote and became a chloroplast (primary endosymbiosis).
Primary Endosymbiosis
Photosynthetic eukaryotes.
Synapomorphy of Chloroplasts
Glaucophytes, Red Algae, Green Algae.
Green Algae as Relatives
Coleochaetophytes, Charaphytes.
Alternation of Generations
Gametophyte (haploid) and sporophyte (diploid).
Sporophyte Generation
Haploid spores by meiosis.
Gametophyte Generation
Haploid gametes by mitosis.
Nonvascular Plants
Marchantiophyta (liverworts), Bryophyta (mosses), Anthocerophyta (hornworts).
Vascular Tissue
Xylem (transports water) and Phloem (transports sugars).
Phylum Lycophyta
Club mosses, spike mosses, and quillworts.
Phylum Monilophyta
Ferns and horsetails.
Homospory vs. Heterospory
Homospory = one type of spore; Heterospory = two types of spores (microspore and megaspore).