The life cycle of a moss Bryophyta Raindrop

• The life cycle of a moss (Bryophyta) Raindrop 1 Spores develop into threadlike protonemata. Key Male gametophyte Haploid (n) Sperm Diploid (2 n) “Bud” 4 Antheridia 2 Protonemata 3 “Bud” Egg Spores Gametophore Female Archegonia gametophyte 8 Peristome Rhizoid 6 Sporangium MEIOSIS Mature sporophytes Seta FERTILIZATION Capsule (sporangium) Calyptra Zygote (within archegonium) Embryo Foot Archegonium Young sporophyte Capsule with peristome (LM) Figure 29. 8 Female gametophytes 7 5

• Bryophyte diversity Gametophore of female gametophyte LIVERWORTS (PHYLUM HEPATOPHYTA) Foot Seta 500 µm Sporangium HORNWORTS (PHYLUM ANTHOCEROPHYTA) Sporophyte MOSSES (PHYLUM BRYOPHYTA) Sporophyte Gametophyte Figure 29. 9

• The life cycle of a fern 1 3 2 Key Haploid (n) Diploid (2 n) Antheridium Spore MEIOSIS Young gametophyte Sporangium Mature sporophyte New sporophyte Archegonium Egg Zygote Sporangium FERTILIZATION Sorus 6 4 Gametophyte Fiddlehead Figure 29. 12 5 Sperm

• Seedless vascular plants LYCOPHYTES (PHYLUM LYCOPHYTA) Strobili (clusters of sporophylls) A quillwort A spike moss A club moss PTEROPHYTES (PHYLUM PTEROPHYTA) Vegetative stem Strobilus on fertile stem Figure 29. 14 WHISK FERNS AND RELATIVES HORSETAILS FERNS