. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 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, greenish fila- ments quite analogous to the Conferva? (frog's-spawn). From these, at length, buds arise and grow into a true moss. Ferns, also, and Equisetace
. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 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, greenish fila- ments quite analogous to the Conferva? (frog's-spawn). From these, at length, buds arise and grow into a true moss. Ferns, also, and Equisetacese, first from the spore exist in tho form of a liverwort—a small green thallus, creeping and rooting along the ground. Secondly, upon this prothaHus 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 of 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 652 55S 554 655 556 557 552, Zoospore of one of the Confervae (Chaetophora). 553, Phytozoon of Chara. 554, Anthe- ridinm of Fucus containing two phytozoa. 555, Zoospore of Conferva with a tuft of cilise. 650, Another species with but two cilise. 55T 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, booksubjectbotany, booksubjectplants, bookyear18
