the life cycle of a moss (bryophyta)
DESCRIPTION
Raindrop. Key. Male gametophyte. Haploid ( n ). Spores develop into threadlike protonemata. Sperm. Diploid (2 n ). 5. 6. 3. 8. 4. 2. 1. “Bud”. Antheridia. Protonemata. “Bud”. Egg. Spores. Gametophore. Female gametophyte. Archegonia. Peristome. Rhizoid. Sporangium. - PowerPoint PPT PresentationTRANSCRIPT
• The life cycle of a moss (Bryophyta)
Maturesporophytes
Youngsporophyte
Malegametophyte
Raindrop
Sperm
Key
Haploid (n)
Diploid (2n)
Antheridia
Femalegametophyte
Egg
Archegonia
FERTILIZATION
(within archegonium)Zygote
Archegonium
Embryo
Femalegametophytes
Gametophore
Foot
Capsule(sporangium)
Seta
Peristome
Spores
Protonemata
“Bud”
“Bud”
MEIOSIS
Sporangium
Calyptra
Capsule with peristome (LM)
Rhizoid
Maturesporophytes
Spores develop intothreadlike protonemata.
1
2
3
4
8
6
5
7
Figure 29.8
• Bryophyte diversity
LIVERWORTS (PHYLUM HEPATOPHYTA)
HORNWORTS (PHYLUM ANTHOCEROPHYTA) MOSSES (PHYLUM BRYOPHYTA)
Gametophore offemale gametophyte
Foot
Sporangium
Seta
500
µm
Sporophyte
Gametophyte
Sporophyte
Gametophyte
Figure 29.9
• The life cycle of a fern
4
1 2 3
6
5
MEIOSIS
Sporangium
Sporangium
Maturesporophyte
Newsporophyte
Zygote
FERTILIZATION
Archegonium
Egg
Haploid (n)Diploid (2n)
Spore Younggametophyte
Fiddlehead
Antheridium
Sperm
Gametophyte
Key
Sorus
Figure 29.12
• Seedless vascular plantsLYCOPHYTES (PHYLUM LYCOPHYTA)
PTEROPHYTES (PHYLUM PTEROPHYTA)
WHISK FERNS AND RELATIVES HORSETAILS FERNS
A quillwort
A spike moss
A club moss
Strobili(clusters ofsporophylls)
Vegetative stem
Strobilus onfertile stem
Figure 29.14