LIFE 103 1st Edition Lecture 7 Outline of Last Lecture I A summary of life II Context of Life I Numbers and figures III Derived traits of land plants I Alternation of generations II Spores III Gametangia IV Linear growth i All absent or lost in common ancestor IV Haploid vs Diploid V Key terms I Gametophyte II Sporophyte VI Nonvascular plants I Liverworts II Hornworts III Mosses Outline of Current Lecture I Mosses I Anatomy II Sequence III Ecology II Ferns and other seedless plants I Anatomy II Other derived traits III Diversity Current Lecture Seedless Land Plants Moss Anatomy I II III Antheridia flowery small one I Structure that releases sperm Archegonium begin procreation I Structure produces and houses egg zygote Mature sporophytes grow atop female gametophytes These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute IV V Fig 29 9d I Polytrichum commune hairy cap moss II Where is meiosis happening Sporophyte cap III Capsule and seta sporophyte Fig 29 8 1 I Mosses can t have sex without water II Gametophyte is bigger dominant life stage Moss Ecology I II III Wetland moss genum Sphagnum is especially widespread Sphagnum decay in wetlands is very slow so wetlands accumulate dead Sphagnum tissues Storage of carbon in Sphagnum wetlands affects global temperature by reducing the amount of CO2 in the atmosphere Ferns and other Seedless Plants I II III Life cycle I Anatomy II Sequence Other derived traits I Vascular transport Diversity Fern Anatomy I II III IV Life cycle dominated by sporophyte diploid Mature gametophyte haploid releases both eggs and sperm I Sperm released from antheridia II Eggs released from Archegonium Spots on underside of fern leaves I Sorus plural sori II Sorus collection of sporangia III Sporangia capsule containing haploid spores Fig 29 13 1 Derived traits of Seedless Vascular Plants I II Reduced importance of gametophyte I Gametophyte becomes even more reduced in seed plants Vascular tissues I Conduct water through xylem transport sugars in phloem II Xylem is strengthened by compound lignin III Rigid xylem tissues allow for tall growth Seedless Plant Phyla I II Lycophyta wolf plant I Club mosses spike mosses and quillworts II Important phylum 300 million years ago III Explosive spores check out lycopodium spores on YouTube Pterophyta wing plant I Ferns horsetails and whisk ferns II Fig 29 15 picture of a horsetail whisk fern III Whisk fern yellow things are the tiny bumps Clicker question In mosses the dominant life stage is the gametophyte while in ferns it is the sporophyte
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