. Botany of the living plant. Botany. LYCOPODIALES 321 The germination of both types of spores may begin before they are shed, but it is continued on the moist soil. The microspore first partitions off a lenticular cell, which is vestigial like those in the pollen-grains of Pinus, representing a male prolhallus. The rest of the contents segment to form a wall of eight sterile cells surrounding a numerous group of spermatocytes (Fig. 264, A). A mucilaginous change appears in the walls of these latter cells. Meanwhile their protoplasts form each a single curved spermatozoid, motile in water by t
. Botany of the living plant. Botany. LYCOPODIALES 321 The germination of both types of spores may begin before they are shed, but it is continued on the moist soil. The microspore first partitions off a lenticular cell, which is vestigial like those in the pollen-grains of Pinus, representing a male prolhallus. The rest of the contents segment to form a wall of eight sterile cells surrounding a numerous group of spermatocytes (Fig. 264, A). A mucilaginous change appears in the walls of these latter cells. Meanwhile their protoplasts form each a single curved spermatozoid, motile in water by two cilia. Swelling of the mucilage by water bursts the wall of the spore, and the spermatozoids escape (Fig. 264, B). The germination of the megaspores produces an internal tissue of greater extent, which may be styled the female prolhallus. Its develop-. 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and co. , limited
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
