. Botany; principles and problems. Botany. 322 BOTANY: PRINCIPLES AND PROBLEMS the archegonium are carried up with it and form a protecting cap or calypira which covers the young capsule. The capsule itself (Fig. 197) possesses a central columella and much other sterile tissue, so that the spore-bearing layer, which surrounds the columella, is relatively thin. The operculum drops off at. Fig. 197.—Longitudinial section through the capsule of a moss (Polytrichum). st, seta, ap, spophysis. w, wall, c, columella, s, spore-sac, surrounded on both sides by loose tissue. {From Goebel). maturity and
. Botany; principles and problems. Botany. 322 BOTANY: PRINCIPLES AND PROBLEMS the archegonium are carried up with it and form a protecting cap or calypira which covers the young capsule. The capsule itself (Fig. 197) possesses a central columella and much other sterile tissue, so that the spore-bearing layer, which surrounds the columella, is relatively thin. The operculum drops off at. Fig. 197.—Longitudinial section through the capsule of a moss (Polytrichum). st, seta, ap, spophysis. w, wall, c, columella, s, spore-sac, surrounded on both sides by loose tissue. {From Goebel). maturity and the liberation of the spores is controlled by a ring of teeth projecting inward from the edge of the wall. Just below the capsule there is typically an enlarged region, the apophysis, which is often brightly colored and may sometimes possess chlorophyll. The capsule is very diverse in size, shape, and structure throughout the whole 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 Sinnott, Edmund Ware, 1888-. New York, McGraw-Hill
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1923
