Upload
rosanna-lombres
View
64
Download
0
Tags:
Embed Size (px)
Citation preview
Bryophyta (mosses)
• Mosses are small plants requiring stereoscopes and compound microscopes for routine examination.
• Moss colonies are a very important element in many ecosystems, from the tundra to the tropical rain forest, reducing soil erosion, capturing water and nutrients, providing shelter for microfauna, and nurseries for seedlings in succession or regeneration processes.
Hepaticophyta (Liverworts)
• Liverworts are covered with cuticle. Some species have pores that allow gas exchange; in species that lack pores, the cuticle is very thin.
• Liverworts got their name because some species native to Europe
• have liver-shaped leaves.
Anthocerophyta (Hornworts)• Most species are small and
unassuming greasy blue-green patches, but some tropical species can cover large areas of soil or the sides of trees.
• Hornworts are a very unusual group of plants.
• Hornworts are a problematic group for evolutionary biologists.
SEEDLESS PLANTSPhylum Pterophyta (FERNS)
Common Name: Black-Stick Maiden Hair
Scientific Name: Adiantum tenerum
Description: This fern is found throughout tropical
America. It likes plenty of light and prefers growing on limestone or in limestone
derived soil.
Common Name: Bird’s Nest Fern
Scientific Name: Asplenium nidus
Description: This thick, leathery leaves minimize water loss, and funnels water and debris into the spongy mass of roots.
FERNS• Can grow almost anywhere.• Have an underground stem called a
rhizome.• Leaves are called fronds.
Did You Know?Ferns are very ancient group of plants. They are supposed to
be older than land animals and even dinosaurs. They were
actually growing on Earth for 2 hundred million years.
WHISK FERNS (PHYLUM PSILOPHYTA)
• The vast majority of psilotophytes belong to the genus Psilotum, which contains 129 species of whisk ferns.
• They frequently grow as weeds in greenhouses.
HORSETAILS (PHYLUM ANTHROTOPHYTA)
• The only living genus is Equisetum, consisting of 15 species commonly known as horsetails.
• Horsetails are practically indistinguishable from fossils 400 million years old.
• Commonly known as “scouring rushes”
CLUB MOSSES (Phylum Lycophyta)
• Club Mosses have horizontal branching stems, both underground and above.
• This is one of the oldest living plants still around on Earth.
• The plant itself was once used extensively as a Christmas green.
Seed borne in plants(Gymnosperms)• The gymnosperms are a group of seed-
producing plants that includes conifers, cycads, Ginkgo, and Gnetales.
• Gymnosperms have major economic uses. Pine, fir, spruce, and cedar are all examples of conifers that are used for lumber. Some other common uses for gymnosperms are soap, varnish, nail polish, food, gum, and perfumes.
Phylum Coniferophyta (CONIFERS)• Conifers adapted to temperate to
cold regions• Narrow leaves (needles) help to
conserve water• Covered by resins – for protection
from predators, fire, etc.
Phylum Ginkgophyta (Ginkgos)• Ginkgo is a genus of highly unusual
non-flowering plants.• Ginkgophyta has only on living
species – Ginkgo biloba.• The leaves are lobed.• Like Cycads, Ginkgos have separate
male and female trees.
Phylum Gnetophyta (Gnetophytes)
• The gnetophytes differ from other gymnosperms in having vessel elements as found in flowering plants.
• Usually dioecious with "flowers" unisexual in compound strobili or "inflorescences".
Seed enclosed with a FruitPHYLUM Anthophyta (Angiosperms)
• Largest group of plants: 250,000 species!
Cahaba Paintbrush
CahabaTorch
Class Dicotyledonae (Dicots)• Flowering plants whose seed typically
has two embryonic leaves or cotyledons.
• There are around 199,350 species within this group.
• Dicotyledons are not a monophyletic group, and therefore the names "dicotyledons" and "dicots" are paraphyletic terms.
Class Monocotyledonae (Monocots)• Monocot seedlings typically have one
cotyledon (seed-leaf), in contrast to the two cotyledons typical of dicots. Monocots have been recognized at various taxonomic ranks, and under various names.
• There are 59,300 species of monocots.• The earliest fossils presumed to be
monocot remains date from the early Cretaceous period.