. First forms of vegetation. Botany; Cryptogams. LICHENS. "3 and minutest lichens. New modes of reproduction are superadded to the primary one; and all these kinds of fructification are sometimes found on one plant at the same time, each of them being capable, under certain conditions, of producing perfect individuals similar to the parent plant. It must not be supposed, however, that they all exercise their functions at one and the same Fig. 8.—Umbilicaria Section of apothecium and of Ihallus, showing the rhizinse. Section of thallus, showing spermagone. time—for nature is n
. First forms of vegetation. Botany; Cryptogams. LICHENS. "3 and minutest lichens. New modes of reproduction are superadded to the primary one; and all these kinds of fructification are sometimes found on one plant at the same time, each of them being capable, under certain conditions, of producing perfect individuals similar to the parent plant. It must not be supposed, however, that they all exercise their functions at one and the same Fig. 8.—Umbilicaria Section of apothecium and of Ihallus, showing the rhizinse. Section of thallus, showing spermagone. time—for nature is never prodigally wasteful of her resources; but where situation, temperature, or other conditions interrupt propagation by one mode, another is developed more exuberantly than usual to supply its place. If there be not conditions to produce perfect apothecia, there will be soridia, pulvinuli, or cyphellae instead; and just as the chances of failure are great, so are H. 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 Macmillan, Hugh, 1833-1903; Macmillan, Hugh, 1833-1903. Footnotes from the page of nature. London, Macmillan
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1874
