the evolution of seed plants feb. 18 and 23, 2011 life cycle of the pines origin of the seed chapter...
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Abies amabilis - Oregon Pinus edulis - New MexicoTRANSCRIPT
The Evolution of Seed Plants
Feb. 18 and 23, 2011 • life cycle of the pines• origin of the seed
Chapter 30
1) origin from ancestors similar to charophytes…
Abies amabilis - Oregon Pinus edulis - New Mexico
Pinus elliottii - Georgia coast Pinus ponderosa - Colorado mts.
Pinus aristata - Colorado Sequoia sempervirens - Calif.
Figure 30.9 The life cycle of a pine (Layer 3)
POLLEN AND SEED CONES OF A PINE
Seed cones
pollen cones
Pollen Cones on a pine tree
Figure 30.10x1 Pine Sporangium with spores
Pine pollen in hand.
dispersed pollen
Male gametophyte growing in nucellus
early pollen
The target of the pollen is the ovule -- near the axis of the seed cone.
Integument
Eggs
Male gametophytes(Megasporangium)
Figure 30.10x3 Pine embryo
Figure 30.9 The life cycle of a pine (Layer 1)
Integument
Figure 30.9 The life cycle of a pine (Layer 2)
Integument
Integument
Figure 30.9 The life cycle of a pine (Layer 3)
Integument
Integument
The Evolution of Seed Plants
• life cycle of the pines• origin of the seed
COAL MEASURE SEQUENCE AT POINT ACONI,CAPE BRETON ISLAND.
COAL
SHALE (MUD STONE) with scattered leaf fossils
SHALE with rootbearing Fossils in place
Seed fern fossils provide cluews to the origin of the seed.
Seed fern fossils provide cluews to the origin of the seed.
Reconstruction of the seed fern Medullosa.
a coal swamp, dominated by spore-dispersed plants
Reconstructions of seed fern seeds
Origin of the Seed. I
Origin of the Seed. II