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This illustration shows the structure of dicotyledonous seeds: A, nearly mature seed of Lepidium. The embryo consists of the hypocotyl, hy, ending below in the root, r, and the root cap and above the epicotly, pl. Two cotyledons, c; arise laterall from the stem; f, funiculus; mi, micropyle; in, integuments, en, remains of endosperm. B, section of seed of water lily-e, embryo with two cotyledons attached laterally to the minute stem of the embryo and surrounded by a layer of endosperm cells; mg, sporangial cells or perisperm; i, integument.

Dicotylendonous

This illustration shows the structure of dicotyledonous seeds: A, nearly mature seed of Lepidium. The…

This illustration shows stages in the germination of the gametospore of Lepidium, sectional view: A, micropylar end of embryo sac, showing the enlarging gametospore provided with cell wall and attached to wall of sac. B, later growth-s, suspensor; e, embryo cell; en, endosperm cells. C, pro-embryo after first division of embryo cell. D, further divisions of embryo cell, showing formation of an epidermis and a central stem region. E, later growth, two growing regions, the cotyledons, appearing on the sides of the stem. F, plant or embryo, consisting of two cotyledons, c; stem, st, which terminates in the root, r; the endosperm cells, en, are ebing absorbed by the enlarging embryo; s, suspensor.

Lepidium

This illustration shows stages in the germination of the gametospore of Lepidium, sectional view: A,…