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This illustration shows the germination of the gametospore: A, section of a mature archegonium with canal cells dissolved, thus forming a passageway to the large female gamete, g. B, sectional view of base of archegonium, showing the germinating gametospore in two-cell stage. The perianth, p, is seen growing up about the archegonium. C, later stage in growth of the gametospore. The lower cell shown in B is forming stalk cells, while the outer cell has produced densely granular cells that will later by further division form spore mother cells and elaters.

Gametospore

This illustration shows the germination of the gametospore: A, section of a mature archegonium with…

This illustration shows the features in the life history of Pandorina: A, a colony of plants. B, each plant of the colony dividing to form a new colony. C, the plants of a colony escaping as gametes. D, the conjugation of two gametes of unequal size. E, later stage in the conjugation. F, gametospore or resting spore. G, Large zoospore formed from the gametospore. H, a colony formed by the division of the zoospore, G.

Pandorina

This illustration shows the features in the life history of Pandorina: A, a colony of plants. B, each…