Nonvascular Plants and Seedless Vascular Plants BSC 2011L

Plants  Domain Eukarya  Kingdom Plantae  “Bryophytes” - nonvascular seedless plants  Phylum HepatophytaLiverworts  Phylum AnthocerotophytaHornworts  Phylum BryophytaMoss  “Vascular Seedless Plants”  Phylum LycopodophytaClub Moss  Phylum MonilophytaWisk fern  Phylum MonilophytaHorsetails  Phylum MonilophytaFerns

Alternation of Generations  Sporophyte Generation  Produces haploid spores by meiosis  Gametophyte Generation  Produces gametes by mitosis

Nonvascular Seedless Plants  Mosses, liverworts, and hornworts  Gametophyte generation is dominant  Produces eggs in archegonia  Produces flagellated sperm in antheridia  Rely on water source for reproduction Notice the gemmae cups In this liverwort

Nonvascular Seedless Plants Moss Life Cycle

 Before you leave the lab:  Do you understand the alternation of generations?  What is the sporophyte generation? The gametophyte generation?  In the gametophyte generation, what is the archegonia? What is the antheridia?  Which generation is dominant in nonvascular plants?  Did you look at the seedless plant examples on the lab benches?  Microscope Slides:  Moss (Mnium)  Antheridia  Archeagonia

Vascular Seedless Plants  Whisk ferns, club mosses, horsetails, and ferns  Sporophyte generation is dominant  Adaptations for living on land  Vascular tissue  Windblown spores

Vascular Seedless Plants Fern Life Cycle

What is a Thallus?  Body of a lower plant that has no recognizable shoot, root, or leaf regions  Fern prothallus - gametophyte Young sporophyte emerging from prothallus

Vascular Seedless Plants Cross Section of Frond Leaflet  Sporophyte Generation  Look at Figure  The sorus contains the sporangium where the spores are produced

 Before you leave the lab:  What does it mean to have vascular tissue?  Did you look at the seedless vascular plant examples on the lab bench?  Is the sporophyte or gametophyte generation dominant in these plants?  What are microphylls?  Can you identify the fern prothallus under the microscope?  Microscope slides:  Fern prothallus  Fern sori  do you see the spores?