5. Fossils evidence suggests that some groups formed dominant flora in the past. Today ferns are prominent in some cool, moist areas. - direct descendants of earliest land plants; fossils of their relatives are 410 million years old (late Silurian period) - Terrestrial or epiphytic - instead of roots have rhizomes (underground stems with many rhizoids) - forked stems with very simple vascular tissue - spore cases form at tips of short branchs - only two genera known
6. Club mosses (e.g. Huperzia species) (previously known as Lycopodium species) - prostrate, branching stem with upright branches - simple vascular systems - spore-bearing leaves arranged in cones in some species - motile sperm (male gametes)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
8. Ferns - rhizomes (underground stem), roots and leaves - vascular tissue grouped in strands (bundles) - leaves bear spores in sporangia - gametophyte is heart-shaped, small, green and completely independent - motile sperm
9. Vascular plants with seeds Groups include: âą primitive seeds ferns (now extict) - e.g. Glossopteris and Gangamopteris âą flowering plants - monocotyledons and dicotyledons âą cycads âą Ginkgo biloba âą conifers Seed ferns (e.g. Glossopteris )
10. extinct, but many fossils found, particularly in the Permian coal measures of NSW and Qld - fern-like appearance Cycads (e.g. Macrozamia various species) - separate male and female cones - motile sperm Ginkgo biloba
11. - cultivated around Chinese and Japanese temples - once thought extinct in the wild but since discovered in remote regions of western China - fan-shaped leaves - separate male and female trees
12. - most have true cones - pollinated by wind - naked seeds - i.e. not surrounded by ovary wall - source of economically important timber - e.g. pine species, Western Red Cedar, Oregan and Australian native cypress pine Conifers
13. Flowering plants (angiosperms) - complex vascular tissue - dominate land vegetation except coniferous forests - great variation in form - shrubs, trees, climbers; woody and non-woody - structurally adapted to land habitats of great diversity, but also aquatic - pollinated by animals - e.g. insects, birds and mammals - as well as wind and water - flowers have stamens (male sex organs) and carpels (female sex organs) - seeds within a closed structure (fruit) - economically important
14. (e.g. grasses, palms) âą have one seed leaf (cotyledon) âą leaves narrow with parallel veins âą vascular bundles scattered Monocotyledons
15. ( e.g. daisy, eucalypts) âą have two seeds leaves (cotyledons) âą marked netted veins âą flower parts in fours or fives âą vascular bundles arranged in cylinders Dicotyledons
16. Fungi Fungi lack chlorophyll and so are unable to make their own food. They are either saprophytes , which live off dead plants and animals, or parasites , which live off plants and animals. PLANT-RELATED ORGANISMS
17. Lichens are very unusual in that they are made of two organisms - an alga and a fungus - living together in a mutually beneficial or symbiotic relationship. Lichens are the first conspicuous organisms to colonise bare rock surfaces. Lichens