. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. 361. Section through antheridiophore of marehantia, showing antheridia. One antheridium more magnified. formed many sperm-cells which are capable of swimming about in water by means of long lashes or cilia attached to them. When the antheridium is mature, its wall ruptures and allows the ciliated sperm- cells to escape. The archegoniophores are also elevated on stalks. (Fig. 359.) In- stead of a simple disk, the receptacle consists of nine or more finger- like rays. Along the under side of t
. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. 361. Section through antheridiophore of marehantia, showing antheridia. One antheridium more magnified. formed many sperm-cells which are capable of swimming about in water by means of long lashes or cilia attached to them. When the antheridium is mature, its wall ruptures and allows the ciliated sperm- cells to escape. The archegoniophores are also elevated on stalks. (Fig. 359.) In- stead of a simple disk, the receptacle consists of nine or more finger- like rays. Along the under side of the rays, between delicately fringed curtains, peculiar flask-like bodies, or archegonia, are situated. The archegonia are not visible to the naked eye. They can be studied only with the microscope (x about 400). One of them much magnified is represented in Fig. 362. Its principal parts are the long neck, a, and the rounded center, b, inclosing a large free cell—the egg-cell. We have seen that the antheridium at maturity discharges its sperm-cells. These swim about in the water provided by the dew and rain. Some of them finally find their way to the archegonia and egg-cells, which are thus fertilized, as pollen fertilizes the ovules of higher plants. After fertilization the egg-cell develops into the spore-capsule or sporogonium. The mature spore- capsules may be seen in Fig. 363. They consist of an oval spore-case on a short stalk, the base of which is imbedded in the tissue of the re- ceptacle from which it derives the necessary nourishment for the de- 363. Archegoniophore . .. W1,h sP'Togoma of veloprnent of the sporogonium. At 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1913
