. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada. Botany; Botany; Botany. THE CRYPTOGAMIA OR FLOWERLESS PLANTS. 129 antheridia (as pollen?) and actively floating until they reach the arche- gones, or perish. 634. Alternate generation is a phenomenon distinctly traced in many of tho cryptogams. Thus the mosses, in germinating, first produce long, greenidh fila- ments quite analogous to the Confervae (frog's-spawn). From these, at length, buda arise and grow into a true moss. Ferns, also, and Equiseta
. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada. Botany; Botany; Botany. THE CRYPTOGAMIA OR FLOWERLESS PLANTS. 129 antheridia (as pollen?) and actively floating until they reach the arche- gones, or perish. 634. Alternate generation is a phenomenon distinctly traced in many of tho cryptogams. Thus the mosses, in germinating, first produce long, greenidh fila- ments quite analogous to the Confervae (frog's-spawn). From these, at length, buda arise and grow into a true moss. Ferns, also, and Equisetacese, first from the spore exist in the form of a liverwort—a small green thallus, creeping and rooting along the ground. Secondly, upon this prothallus reproductive organs are developed and an embryo, whence a true fern arises. Thus the plant is transiently, as it were, a liverwort, permanently, a fern. (§21—23.) 635. Other modes op propagation occur in these plants, as, for example, by innovations, sporules, gonidia. These bodies are analogous to bulbs and bulblets in the flowering plants, originating from the nutritive organs, and capable of sepa- rating from the parent and growing up independent % 062 658 554 555 556 657 552, Zoospore of one of the Confervas (Ch»etophora). 553, PhytozJJbn of Chara. 554, Anthe- rldinm of Fucus containing two pbytozoa. 555, Zoospore of Conferva* with a tuft of ciliae. 556, Another sp»cies with bat two ciliae. 557 Zoospore of Vaucheria with cilia all Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wood, Alphonso, 1810-1881. New York : A. S. Barnes & Burr
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectbotany, bookyear1861
