. Botany; principles and problems. Botany. 352 BOTANY: PRINCIPLES AND PROBLEMS stout woody stem is secondary wood, laid down by an active cambium. Its water-conducting cells are all tracheids, those produced in the spring being comparatively wide and thin-walled. Fig. 221. Fig. 222. Fig. 221.—Cycas. Sporophyll from ovulate cone, showing several ovules attached to its side. One of these has developed into a seed. {From Strasburger, after Sachs). Fig. 222.—Cycas. Sporophyll from staminate cone, showing numerous pollen sacs or microsporangia. (From Strasburger, after Richard). * k Fig. 223.—Stami
. Botany; principles and problems. Botany. 352 BOTANY: PRINCIPLES AND PROBLEMS stout woody stem is secondary wood, laid down by an active cambium. Its water-conducting cells are all tracheids, those produced in the spring being comparatively wide and thin-walled. Fig. 221. Fig. 222. Fig. 221.—Cycas. Sporophyll from ovulate cone, showing several ovules attached to its side. One of these has developed into a seed. {From Strasburger, after Sachs). Fig. 222.—Cycas. Sporophyll from staminate cone, showing numerous pollen sacs or microsporangia. (From Strasburger, after Richard). * k Fig. 223.—Staminate or "male" cones of the pine. and those in the summer nuich narrower and thicker-walled (Fig. 63). The general structure of the vascular tissues approaches rather closely to that of the angiosperms,. 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
