POLLEN, SEEDS, AND PLANT REPRODUCTION 4.Life cycle of Selaginella 5.General features of plant reproductive development and ecology 6.Life Cycle of the.

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Presentation transcript:

POLLEN, SEEDS, AND PLANT REPRODUCTION 4.Life cycle of Selaginella 5.General features of plant reproductive development and ecology 6.Life Cycle of the pines 7.Origin of the seed

Abies amabilis - Oregon Pinus edulis - New Mexico

Pinus elliottii - Georgia coastPinus ponderosa - Colorado mts.

Pinus aristata - Colorado Sequoia sempervirens - Calif.

POLLEN AND SEED CONES OF A PINE Seed cones pollen cones

Pollen Cones on a pine tree

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.

POLLEN, SEEDS, AND PLANT REPRODUCTION 4.Life cycle of Selaginella 5.General features of plant reproductive development and ecology 6.Life Cycle of the pines 7.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.

Reconstruction of the seed fern Medullosa.

Reconstructions of seed fern seeds

Origin of the Seed.