. Text-book of botany, morphological and physiological. Botany. FIG. 266.—Funaria hygrometrica ; A a young leafy plantg with the calyptra c; B a plant g with the nearly ripe sporogo- nium, s its seta,/" the theca, c the calyptra ; C longitudinal sec- tion of the theca bisecting it symmetrically ; d operculum, a annulus, p peristome, c c' columella, h air-cavity, s the pri-^ mary mother-cells of the spores. FIG. 267.—Mouth of the theca of Fotitinalis antipyretica; ap outer peristome, i inner peri- stome. After Schimper (X 50). below, and firmly implanted in the vaginula; the theca always o
. Text-book of botany, morphological and physiological. Botany. FIG. 266.—Funaria hygrometrica ; A a young leafy plantg with the calyptra c; B a plant g with the nearly ripe sporogo- nium, s its seta,/" the theca, c the calyptra ; C longitudinal sec- tion of the theca bisecting it symmetrically ; d operculum, a annulus, p peristome, c c' columella, h air-cavity, s the pri-^ mary mother-cells of the spores. FIG. 267.—Mouth of the theca of Fotitinalis antipyretica; ap outer peristome, i inner peri- stome. After Schimper (X 50). below, and firmly implanted in the vaginula; the theca always opens by the de- tachment of its upper part as a lid {Operculum); the operculum is either simply and smoothly detached from the lower part of the theca, or a layer of epidermal cells termed the Annulus is thrown off in consequence of the swelling of their inner walls, and the operculum in this way separated from the theca. 'Most commonly, after the operculum has fallen off, the margin of the theca appears furnished with appendages of very regular and elegant form arranged in one or two rows; the separate append- ages are termed Teeth or Cilia, the whole together the Peristome; if the peristome is wanting, the theca is said to be gymnostomous. The theca is at first a solid homo- geneous mass of tissue; the differentiation of its interior begins with the formation of an annular intercellular space which separates off the wall of the theca consisting of several layers of cells; but the wall remains attached above and below to the colu- cells of the spores are not derived from a single primary cell. A variable number of spore-mother- cells (1-7) are developed independently, each of which gives rise to four spores. They are arranged quite 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 Sachs, Jul
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1882
