. A manual of botany. Botany. 116 MANUAL OF BOTANY to develop. There is no special perichaetium produced as in the liverworts. Among the sexual organs are developed hairs of peculiar form known as paraphyses. Fig. 875. These are multicellular, and often terminate in a globular head. They are singular in that their cells often contain chloroplastids. The antheridia differ but little from those of the Hepaticse ; they are club-shaped or rounded bodies, mounted on short stalks, and con- sist of a wall surrounding a cavity in winch are the antherozoids. They open in the mosses by spUt- ting across
. A manual of botany. Botany. 116 MANUAL OF BOTANY to develop. There is no special perichaetium produced as in the liverworts. Among the sexual organs are developed hairs of peculiar form known as paraphyses. Fig. 875. These are multicellular, and often terminate in a globular head. They are singular in that their cells often contain chloroplastids. The antheridia differ but little from those of the Hepaticse ; they are club-shaped or rounded bodies, mounted on short stalks, and con- sist of a wall surrounding a cavity in winch are the antherozoids. They open in the mosses by spUt- ting across the apex. The mother cells of the antherozoids escape before emitting the antherozoids. They are attached to each other by a sort of intercellular mucUago derived from the cell-walls. This, however, dissolves as soon as it comes into contact with water. The archegonia have the same general structure as those in the preceding group (fig. 875). There is a body or venter, and a long generally twisted neck. The body or venter is usually thicker than in the liverworts, and consists of two layers of cells. It contains, as in other cases, an oosphere, while the neck is filled with mucilage derived from the disintegration of its canal- cells and of the ventral canal-cell cut ofl' in the formation of the Neck of oosphere. The vegetative reproduction of the gametophyte is very varied. The chief feature of it is the ease with wliich almost any part of the plant can produce protonemal filaments, even root hairs doing so if exposed to light in a moist atmosphere. Similar outgrowths may spring from the rhizoids, or from the leaves, or frcm. Fi(/. 875. A. Apex of stioot of Funaria with two archegonia. archegouium, showing mode of separation of the cells, c. Immature archegonium. After 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 t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
