pollen, seeds, and plant reproduction 4.life cycle of selaginella 5.general features of plant...

POLLEN, SEEDS, AND PLANT REPRODUCTION

4. Life cycle of Selaginella5. General features of plant reproductive

development and ecology6. Life Cycle of the pines7. Origin of the seed

Abies amabilis - Oregon Pinus edulis - New Mexico

Pinus elliottii - Georgia coast Pinus 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 Selaginella5. General features of plant reproductive

development and ecology6. Life Cycle of the pines7. 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.

Reconstructions of seed fern seeds

Origin of the Seed.

Origin of the Seed.