Elementary botany . Fig. 391. GAMETOPHYTE AND SPOROPHYTE. 329 nucleus with the egg nucleus it is called double fertilization. Thesperm nucleus is usually smaller than the egg nucleus, but oftengrows to near or quite the size of the egg nucleus before figs. 394 and 395. 657. Fertilization in plants is fundamentally the same asin animals.—In all the great groups of plants as represented byspirogyra, cedogonium, vaucheria, peronospora, ferns, gymno-.

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